Amazon.com: Hifonics Brutus BW-110A - 800 Watts Compact Amplified Under The Seat Car Truck Subwoofer Low Profile with Bass Remote, Great for Vehicles That Need Bass But Have Limited Space, Black :
PowerBass PS-AWB101T Truck-style 175-watt powered 10" subwoofer at Crutchfield
Amazon.com: BOSS Audio Systems BASS8 8 Inch Under Seat Powered Car Subwoofer – 800 High Output, Low Profile, Built in Amplifier, for Truck, Boxes and Enclosures, Remote Subwoofer Control : Electronics
Rockford Fosgate P300-12T 12” Truck/Wedge Powered Subwoofer- 300 Watts Rms, H 15” X W 25.8” X D 8.5” - Creative Audio
BOSS Audio Systems BAB10 10 Inch Powered Under Seat Car Audio Subwoofer - 1200 Watts Max, Low Profile, Remote Subwoofer Control, For Truck, Boxes and Enclosures - Walmart.com