Ending today, Newegg offers the SeaSonic S12II ATX12V V2.3 520-watt Power Supply Unit for $43.90. Redeem this $20 mail-in rebate to cut it to $23.90. With free shipping, that's the lowest price we could find by $26 and the best price we've seen. It's 80 PLUS Bronze-certified and features two PCI-Express connectors and six SATA connectors.