$200 · POLK PSW505 12-Inch Subwoofer

Owned for a few years with my home theater set up, and she's been good to me. Fantastic subwoofer with deep, rich and clean bass that'll shake your house with excessive output at 500 watts (or 250 watts RMS). This subwoofer has had no mechanical failures and is in mint condition. Sells for $530 new on amazon before tax, but why buy new when you can get one in great condition for nearly half the cost? set on the price.