Best Buy has the Samsung BX2231 31 Series 21.5in Flat-Panel LED Monitor for only $140 w/ free shipping. free in-store pickup.

NewEgg has the System & Hardware Deals Sale.

Computer accessories

$5 off Rosewill RCX-ZAIO-92 92mm Sleeve Bearing Fan CPU Cooler $14.99 w/ code: EMCKDKA69 (exp 6/15)
Creative Sound Blaster Audigy SE 7.1 Channels 24-bit 96KHz PCI Interface Sound Card - OEM $24.99 free shipping w/ code: EMCKDKA72 (exp 6/15)
Extra $5 off Logitech M500 Tilt Wheel USB Corded Laser 1000 dpi Mouse $28.99 w/ code: EMCKDKA63 (exp 6/15)
Extra $5 off Rosewill RK-800G Black 104 Normal Keys PS/2 Wired Gaming Keyboard $9.99 w/ code: EMCKDKA62 (exp 6/15)

Printer

Extra $10 off HP LaserJet Pro P1606DN CE749A Workgroup Up to 26 ppm Monochrome Laser Printer $144.99 w/ code: EMCKDKA59 (exp 6/15)
Extra $10 off SAMSUNG ML-1865w Workgroup Monochrome Wireless Laser Printer $59.99 w/ code: EMCKDKA58 (exp 6/15)

Monitor

Extra $15 off SAMSUNG BX2231 Glossy Black 21.5in 2ms Full HD LED Backlight LCD Monitor w/ code: EMCKDKA49 (exp 6/15)
Extra $10 off ASUS VH236H Black 23in 2ms Full HD Widescreen LCD Monitor w/ Speakers $139.99 After $20.00 MIR w/ code: EMCKDKA48 (exp 6/15)
Extra $40 off LG E2441V-BN Black 24in 5ms Full HD HDMI LED Backlight LCD Monitor $189.99 w/ code: EMCKDKA47 (exp 6/15)
Extra $20 off Acer H274HLBMID Black 27in 5ms Full HD HDMI LED BackLight LCD Monitor w/Speakers $279.99 w/ code: EMCKDKA46 (exp 6/15)

Computer Case & Power Supply

Extra $5 off COOLER MASTER Elite 430 RC-430-KWN1 Black Steel / Plastic Computer Case $35.99 After $10.00 MIR w/ code: EMCKDKA43 (exp 6/15)
$20 off NZXT Phantom PHAN-001WT White Steel / Plastic Enthusiast ATX Full Tower Computer Case $119.99 w/ code: EMCKDKA42 (exp 6/15)
Extra $5 off Antec Nine Hundred Black Steel ATX Mid Tower Computer Case $74.99 After $20.00 MIR w/ code: EMCKDKA39 (exp 6/15)
Extra $5 off Rosewill MicroATX Mid Tower Computer Case, come with 1x 120mm Fan, 450W Power Supply $49.99 w/ code: EMCKDKA38 (exp 6/15)
Extra $10 off Rosewill Xtreme Series 850W Continuous @40°C ,80 PLUS Certified, SLI Ready CrossFire Ready Power Supply $89.99 w/ code: EMCKDKA37 (exp 6/15)
Extra $5 off Antec BP550 Plus 550W Continuous Power ATX12V V2.2 80 PLUS Certified Modular Active PFC Power Supply $44.99 after $15 MIR w/ code: EMCKDKA24 (exp 6/15)

CPU / Memory

$15 off Intel Core i3-540 Clarkdale 3.06GHz LGA 1156 73W Dual-Core Desktop Processor $103.99 w/ code: EMCKDKA35 (exp 6/15)
$5 off AMD Athlon II X2 245 Regor 2.9GHz Socket AM3 65W Dual-Core Desktop Processor - OEM $44.99 w/ code: EMCKDKA34 (exp 6/15)
$10 off AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor $104.99 w/ code: EMCKDKA33 (exp 6/15)
$20 off Patriot Gamer 2 Series 8GB (2 x 4GB) DDR3 1333 (PC3 10666) Desktop Memory $59.99 After $15.00 MIR w/ code: EMCKDKA32 (exp 6/15)
$15 off G.SKILL Value Series 8GB (2 x 4GB) DDR3 1333 (PC3 10600) Desktop Memory $59.99 w/ code: EMCKDKA29 (exp 6/15)
$10 off G.SKILL Ripjaws X Series 4GB (2 x 2GB) DDR3 1600 (PC3 12800) Desktop Memory $39.99 w/ code: EMCKDKA28 (exp 6/15)
$15 off G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-8GBXL $64.99 w/ code: EMCKDKA22 (exp 6/15)

Hard Drive

$10 off Western Digital Scorpio Black 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s Notebook HDD $59.99 w/ code: EMCKDKA27 (exp 6/15)
Extra $5 off Western Digital Caviar Green WD20EARS 2TB 64MB Cache SATA 3.0Gb/s HDD $74.99 w/ code: EMCKDKA26 (exp 6/15)
Extra $10 off Western Digital Caviar Green 750GB IntelliPower 64MB Cache SATA 3.0Gb/s HDD $39.99 w/ code: EMCKDKA25 (exp 6/15)
Extra $10 off HITACHI Deskstar 0S03230 3TB 5400 RPM 32MB Cache SATA 6.0Gb/s 3.5in Internal Hard Drive $119.99 w/ code: EMCKDKA23 (exp 6/15)
Extra $10 off TOSHIBA Canvio Basics 320GB USB 2.0 Black Portable Hard Drive $39.99 w/ code: EMCKDKA52 (exp 6/15)

Software

Extra $5 off Microsoft Windows 7 Home Premium SP1 64-bit - OEM $84.99 w/ code: EMCKDKA44 (exp 6/15)
Extra $5 off Microsoft Windows 7 Professional SP1 64-bit - OEM $124.99 w/ code: EMCKDKA54 (exp 6/15)
Extra $10 off 360Amigo System Speedup - 3 User for System Builders - OEM $14.99 w/ code: EMCKDKA56 (exp 6/15)

Others

Free IOCell Networks Portable XT 251PXT 2.5in Black USB 3.0 External Enclosure after $10 MIR w/ code: EMCKDKA45 (exp 6/15)
Extra $10 off Office 2010 Home and Business Product Key Card (no media) $149.99 w/ code: EMCKDKA55 (exp 6/15)
Extra $10 off LG N2B1D Diskless System Super Multi NAS with Blu-ray Disc ReWriter $199.99 w/ code: EMCKDKA53 (exp 6/15)
Extra $5 off Rosewill Full Aluminum Cover, Metal Tray 3.5in Black USB2.0 & eSATA External Enclosure $19.99 w/ code: EMCKDKA68 (exp 6/15)
$4 off CyberPower 850 6 Feet 8 Outlets 2400 Joules Home/Office Surge Protection $14.99 w/ code: EMCKDKA66 (exp 6/15)
$15 off TRENDnet TK-217I 2-Port USB KVM Switch $14.99 w/ code: EMCKDKA64 (exp 6/15)
Extra $10 off Rosewill PCI Express eSATA II x 2 / ATA 133 x1 RAID 0/1/0+1/JBOD mode Controller Card $14.99 w/ code: EMCKDKA36 (exp 6/15)

NewEgg has the Month-End BLOWOUT sale.

Computer accessories

Extra $5 off MOTOROLA Over-the-ear Bluetooth Headset (H720) $34.99 w/ code: EMCKFHB73 (exp 5/4)
$17 off Sennheiser - Professional DJ styled - Hi-Fi Stereo Headphones (HD 201) $17.99 w/ code: EMCKFHB72 (exp 5/4)
Extra $12 off Sunforce 50013 Solar 12V Power Sports Charger $17.99 w/ code: EMCKFHB69 (exp 5/4)
$5 off Logitech C210 1.3 M Effective Pixels WebCam $24.99 w/ code: EMCKFHB54 (exp 5/4)
$40 off Targus AKB24US Black&Silver 103 Normal Keys USB RF Wireless Standard Keyboard $9.99 w/ code: EMCKFHB53 (exp 5/4)
Extra $5 off Rosewill RCM-8164 True 1.3 M Effective Pixels USB 2.0 WebCam $14.99 w/ code: EMCKFHB52 (exp 5/4)
LITE-ON Black 24X DVD+/-R 2MB Cache SATA 24X DVD Writer $22.99 free shipping w/ code: EMCKFHB33 (exp 5/4)
$10 off Rosewill RC-401-EX 10/ 100/ 1000Mbps PCI-Express Gigabit Low Profile Network Card 1 x RJ45 $14.99 w/ code: EMCKFHB38 (exp 5/4)

Home

$12 off Icon Light MD105A MODUS I Polymer Flashlight 50 Lumens $17.99 w/ code: EMCKFHB68 (exp 5/4)
Extra $20 off Vornado CR1-0021-06 Air Circulator $39.99 w/ code: EMCKFHB67 (exp 5/4)
Extra $20 off McCulloch MC-1246 Portable Power Steam Cleaner Yellow $49.99 w/ code: EMCKFHB66 (exp 5/4)
Extra $5 off Rosewill 43 Pieces Tools Set RTHP -10001 with 1/4in SAE Drive Socket and 1/4in Bit $24.99 w/ code: EMCKFHB65 (exp 5/4)
Extra $30 off WHISTLER XTR-590 Radar Detector $59.99 w/ code: EMCKFHB64 (exp 5/4)
Extra $30 off Recertified: iRobot 560 Roomba Vacuum Cleaning Robot $199.99 w/ code: EMCKFHB75 (exp 5/4)

HDTV & Monitor

Extra $30 off iSymphony 37in 1080p 60Hz LCD HDTV LC37iF80 $399 w/ code: EMCKFHB59 (exp 5/4)
Extra $70 off LG 42in 1080p 120Hz LCD HDTV 42LK520 w/ code: EMCKFHB58 (exp 5/4)
Extra $20 off SAMSUNG BX2231 Glossy Black 21.5in 2ms Full HD LED Backlight LCD Monitor $139.99 w/ code: EMCKFHB43 (exp 5/4)

Speaker

Extra $32 off Polk Audio Monitor60 Series II Floorstanding Loudspeaker (Black) Each $117.99 w/ code: EMCKFHB57 (exp 5/4)
Extra $15 off Logitech Z523 40 Watts RMS 2.1 Speaker System $54.99 w/ code: EMCKFHB55 (exp 5/4)
Extra $30 off Polk Audio Monitor40 Series II Two-Way Bookshelf Loudspeaker (Black) Pair $119.99 w/ code: EMCKFHB62 (exp 5/4)

Printer

Extra $15 off HP Officejet 6500A CN555A Up to 32 ppm 4800 x 1200 dpi Thermal Inkjet MFC / All-In-One Color Printer $74.99 w/ code: EMCKFHB48 (exp 5/4)
Extra $30 off Fujitsu fi-6130 PA03540-B055 24 bit CCD 600 dpi Duplex Scanner $869.99 w/ code: EMCKFHB47 (exp 5/4)
Extra $20 off HP LaserJet P2055dn CE459A Workgroup Up to 35 ppm Monochrome Laser Printer $279.99 w/ code: EMCKFHB46 (exp 5/4)

Computer Case & Power Supply

Extra $5 off Thermaltake V3 Black Edition VL80001W2Z ATX Mid Tower Computer Case $29.99 After $10.00 MIR w/ code: EMCKFHB37 (exp 5/4)
Extra $10 off Rosewill Blackbone Black Steel / Plastic ATX Mid Tower Computer Case $34.99 w/ code: EMCKFHB36 (exp 5/4)
Extra $10 off Antec Basiq BP430 430W Continuous Power Version 2.2 80 PLUS Certified Active PFC Power Supply $19.95 After $15.00 MIR w/ code: EMCKFHB35 (exp 5/4)
Extra $10 off Rosewill RV2-700 700W ATX12V v2.3 / EPS12V SLI Ready Power Supply $49.99 w/ code: EMCKFHB34 (exp 5/4)

CPU / Memory

$10 off G.SKILL Ripjaws Series 4GB (2 x 2GB) DDR3 1333 (PC3 10666) Desktop Memory $44.99 w/ code: EMCKFHB32 (exp 5/4)
$10 off AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 95W Quad-Core Desktop Processor $119.99 w/ code: EMCKFHB29 (exp 5/4)
$25 off CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B $74.99 w/ code: EMCKFHB23 (exp 5/4)

Hard Drive

$25 off Intel 320 Series SSDSA2CW080G3K5 2.5in 80GB SATA II MLC Internal Solid State Drive $169.99 w/ code: EMCKFHB28 (exp 5/4)
Extra $15 off Netgear ReadyNas NV+ 4-bay NAS Drive Enclosure w/ Gigabit & speeds up to 25MBps (Diskless) $284.99 w/ code: EMCKFHB27 (exp 5/4)
$5 off Western Digital Scorpio Blue WD1600BEVT 160GB SATA 3.0Gb/s Notebook Hard Drive $36.99 w/ code: EMCKFHB26 (exp 5/4)
Extra $5 off HITACHI Deskstar 5K3000 2TB 32MB Cache SATA 6.0Gb/s Hard Drive $74.99 w/ code: EMCKFHB25 (exp 5/4)
Extra $10 off Seagate Barracuda 7200.11 1.5TB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive $59.99 w/ code: EMCKFHB24 (exp 5/4)
$5 off HITACHI Deskstar 7K1000.C HDS721010CLA332 (0F10383) 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5in Internal Hard Drive $49.99 w/ code: EMCKFHB22 (exp 5/4)

Others

Extra $5 off Canon A800 Silver 10.0 MP 2.5in 115k LCD 3.3X Optical Zoom Digital Camera w/ code: EMCKFHB63 (exp 5/4)
Extra $5 off Rosewill R2-JBOD Aluminum 3.5in USB 2.0 DUAL-BAY External Enclosure $34.99 w/ code: EMCKFHB56 (exp 5/4)
40% off all Franklin Dictionaries & Translators w/ code: FRANK40 (exp 5/4)
Extra $20 off Naxa Fold Down Full Detachable CD Receiver Model NCA-692 $59.95 w/ code: EMCKFHB76 (exp 5/4)
$7 off Verbatim 4.7GB 16X DVD+R 100 Packs Spindle Disc Model 95098 $17.99 w/ code: EMCKFHB49 (exp 5/4)
Extra $30 off Acer X1261P XGA 1024x768 2700 Lumens 3D Ready DLP Projector $369.99 w/ code: EMCKFHB45 (exp 5/4)
$6 off Team Color Turn 32GB USB 2.0 Flash Drive (Brown) Model TG032GE902CX $33.99 w/ code: EMCKFHB39 (exp 5/4)