Pioneer TS-A2000LD2 - 8-inch Shallow-Mount Subwoofer with 700 Watts Max. Power - Walmart.com
Dayton Audio SD215A-88 8" DVC Subwoofer
Polk Audio db840DVC db Series 8" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: MB Quart DS1-204 Discus Shallow Mount Subwoofer (Black) – 8 Inch Subwoofer, 400 Watt, Car Audio, 2 Inch Voice Coils, UV Rubber Surround, Best in Sealed Enclosures : Electronics