Newegg.com currently has the Corsair 650W power supply (model no. CMPSU-650TX) which is SLI ready, CrossFire ready, has a thermally controlled 120mm fan, and a variety of connectors including one main connector, eight peripheral connectors, eight SATA connectors, two floppy and two PCI-E.  This power supply was priced at $119.99, but has been reduced by $30 to $89.99.  A $20 mail-in-rebate offer cuts the price further to $69.99.  This price drop has made it the lowest price we have seen on this power supply by $10.  FREE shipping is included and sales tax applies for residents of most states. 

Save $10 on the Apevia Java 500-watt power supply at CompUSA.com, it was $49.99, now $39.99.  NextWarehouse.com has the Ultra Lifetime Series Pro 750W power supply priced at $79.84 with FREE shipping.  Save $27 on the Corsair 950-watt TX series 80 plus certified power supply, which is compatible with Intel Core i7 and Core i5 processors, now $139.99 (after rebate) at Amazon.com.