Amazon.com: BESTISAN Powered Subwoofer, 6.5" Active Home Audio Subwoofer in Compact Design,LFE & Stereo Line Inputs & Audio Output, Built-in Amplifier for Home Theater/Receiver/TV/Speakers, Black, SW65D : Everything Else
Monitor XT12 Subwoofer - 100W 12" Woofer | Polk Audio
Premium 140W Gaming PC Subwoofer | Deep Bass | NZXT Relay
Sundown Audio Xv3 12" inch DVC Dual 2 Ohm (X Series) Car Subwoofer 2000 Watts RMS
Amazon.com: Audioengine S8 Powered Subwoofer Speaker - 250W 8-inch Home Subwoofer with Built-in Amplifier and Dual Audio Inputs for Home Speaker System (Black) : Electronics
Massive Audio GTX Series 15-Inch 700-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com