Hi, I have a Sony SA-WM40 Active Powered Subwoofer for sale with original box and manual. It is in good condition, working perfectly, no scratch. I am asking $80 for local pickup or $100 shipped via FedEx. I am in the Washington DC metro area. This one has great reviews and recommended here on the forum. Here is one of the links
I have an almost brand new KLH tremor series sub that I bought as a refurb from UBID. 10" and 100 watts. It is loud and provide will thump. You can have it for $50 and shipping. The same sub is selling at Outpost for $129.