For Prime members only, Amazon offers the SeaSonic S12II Series 620-watt ATX Power Supply for $49.90. Redeem this $15 mail-in rebate to cut it $34.90. With free shipping, that's the lowest total price we could find by $10. This 80 Plus Bronze-certified power supply includes two PCI-Express connectors, eight SATA connectors, and a 120mm fan. Deal ends January 26.