Newegg offers the Seasonic 660-watt Modular ATX Power Supply, model no. SS-660XP2, for $119.99. This $20 mail-in rebate cuts it to $99.99. With free shipping, that's the lowest total price we could find by $40, although we saw it for $20 less in October. This 80 PLUS Platinum-certified power supply features one fan, four PCI-Express connectors, and 10 Serial ATA connectors. Deal ends January 31.

Update: Ending today (1/12), coupon code "EMCEFFF23" takes an additional $20 off the price, making the final cost $79.99 after coupon and rebate.