Mwave offers the Kingwin 1000-watt Power Supply, model no. MK-1000W, for $94.99 with free shipping. That's $5 off and the lowest total price we could find. Features include a 140mm fan, six PCI-E connectors, and eight SATA connectors.
Newegg offers the Corsair 430-watt 80 Plus Bronze ATX Power Supply, model no. CX430, for $39.99. This $20 mail-in rebate cuts it to $19.99. With free shipping, that's the lowest total price we could find by $20, although we saw it for $4 less last month. It features a 120mm fan and four serial ATA power connectors. Rebate expires September 17.