Used APC Back-UPS 500 BK500M Back Up Surge Protector - No Batteries Inc. | eBay
APC Back-UPS 500 - 6ft, AC 120V, 50/60Hz, 300 Watts, 500VA, 480 Joules, Hot-swappable, LED Status Display, 6x NEMA 5-15R, USB, Black - BK500BLK at TigerDirect.com
BE500U | APC Back-UPS ES 500 500VA 1.4 Minute Full Load 3 x NEMA 5-15R 3 x NEMA 5-15R (Refurbished)