Wharfedale Diamond SW-150 Subwoofer, Black at AV.com
Yamaha SW-4 Subwoofer. Extremely clean, no dents, all knobs, works flawlessly. | eBay
Focal Sopra SW 1000 Be ACTIVE SUBWOOFER(black)(each) Focal Sopra SW 1000 Be ACTIVE SUBWOOFER(black)(each) - - It's Free! : New Audio & Video, New Electronics at Lowest Prices!
Wharfedale SW-15 15" powered subwoofer at Crutchfield
Amazon.com: Pioneer SW-8MKS 100W powered subwoofer for home theater : Electronics