Best Buy: Pioneer 12" 800W Single-Voice-Coil 4-Ohm Subwoofer Black/Blue TS-W301R
Crunch CRW12D4 12 Inch 800 Watt MAX Dual Voice Coil Car Subwoofer Speaker - Walmart.com
Pioneer PRO Series 12" 1,500-Watt Subwoofer in the Mobile Audio department at Lowes.com
Amazon.com: Pioneer TS-A300D4 12 Inch 1500 Watts Max Power Dual 4-Ohm Voice Coil A Series Car Audio Stereo Subwoofer Loudspeakers / Free Alphasonik Earbuds : Electronics
Best Buy: Pioneer Champion TS-W254R Woofer 250 W RMS/1100 W PMPO Black, Red TS-W254R
Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer