Amazon has the CORSAIR 550w VX Series 12v ATX 80 Plus Certified Power Supply for $88 with a $30 MIR and free shipping.
Technical Details:
* Form Factor: ATX
* Wattage: 550-Watt
* SLI/Crossfire: SLI Ready
* Modular Cabling: No
* Energy Efficiency: 80 PLUS
* Fan: 120 mm
* Input Voltage: 115 ~ 230
* +3.3V: 30 A
* +5V: 20 A
* +12V 1: 41 A
* -12V: 0.8 A
* +5VSB: 3 A
* 20+4-Pin Connector: 1
* Motherboard Connector: 20+4 Pin
* 4-Pin/8-Pin EPS Connector: 1
* 6-Pin PCI-Express Connector: 2
* 4-Pin Floppy Connector: 2
* 4-Pin Peripheral Connector: 6
Amazon.com: CORSAIR 550w VX Series 12v ATX 80 Plus Certified Power Supply: Electronics $30 MIR
CORSAIR 550w VX Series 12v ATX 80 Plus Certified Power Supply $58 AR + FS 
