Newegg offers the Cooler Master Elite V2 550-watt Power Supply, model no. RS550-PCARN1-US, for $49.99. A $20 mail-in rebate cuts the price to $29.99. With free shipping, that's the lowest total price we could find by $18. Features include a 120mm fan, two PCI-E connectors, and six SATA connectors. Rebate expires September 15.