Monoprice Monolith THX Certified 8in 150-watt Powered Subwoofer, Deep and Powerful Bass, Compact Design, Quick and Easy To Setup, For Home Theater or Gaming Systems - Walmart.com
Mirage Nanosat® 5.1 Compact Home Theater Speaker System 5 satellite speakers and a powered subwoofer with black brushed aluminum finish at Crutchfield
Yamaha YST-FSW050 Low Profile Compact Home Theater Powered Subwoofer - Working | eBay