Memphis Audio 15-SER 12" Street Edge Single 4-Ohm Subwoofer - 200 watt max | eBay
Beale street Audio 6.5' Subwoofer And Amplifier for Sale in Fort Lauderdale, FL - OfferUp
Amazon.com: 2X SoundXtreme Premium Elite ST-410 10 Inch Car Audio Subwoofer 3000 Watts Max Power Dual 4 Ohm Voice Coil High Power Bass Surround Sound 10" Sub Speaker System : Electronics
Beale Street Audio A220, Subwoofer Amplifier 120W Class D - PreOwned works great | eBay