Amazon.com: Polk Audio PSW10 10" Powered Subwoofer – Power Port Technology, Up to 100 Watts, Big Bass in Compact Design, Easy Setup with Home Theater Systems, Timbre-Matched with Monitor & T-series Polk
Kanto SUB8 8-inch Powered Subwoofer – V&L Canada
JBL PSW-1200 12" Powered Subwoofer. Made in Canada - electronics - by owner - sale - craigslist