Newegg has the CORSAIR CMPSU-400CX 400W 80 PLUS Certified Power Supply for $50 with a $20 MIR and free shipping.
Technical Details:
* Extra long cables support full tower chassis
* 80 Plus Certified High efficiency topology to ensure energy savings
* Dedicated single +12V rail offers maximum compatibility with latest components
* Over Current/Voltage/Power Protection, Under Voltage Protection, and Short Circuit Protection provides maximum safety to critical system Components
* 99% Active Power Factor Correction provides clean and reliable power to your system
Newegg.com - CORSAIR CMPSU-400CX 400W ATX12V V2.2 80 PLUS Certified Compatible with Core i7 Power Supply - Power Supplies $20 MIR
CORSAIR CMPSU-400CX 400W 80 PLUS Certified Power Supply $30 AR + FS 
