Amazon offers the Logisys 480-watt Switching Power Supply
, model no. PS480E12, for $13.50
. (It shows "temporarily out of stock" but you can order at this price and it will ship when available.) Plus, Prime members bag free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $9.58.) That's the lowest total price we could find by $3. (Most merchants charge $20 or more.) It features a 120mm fan, 2 SATA connectors, and over-voltage and over-power protection.