Pioneer TS-A2000LD2 - 8-inch Shallow-Mount Subwoofer with 700 Watts Max. Power - Walmart.com
Amazon.com: JBL Club WS1000 10" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
Infinity REF1200S 12" shallow-mount component subwoofer at Crutchfield
Focal P20FSE 8" Shallow Mount FLAX Evo Car Subwoofer 400W Slim Subwoofer BNIB | eBay
35 Series 12" 4Ω Single Voice Coil Shallow Mount Subwoofer | MTX Audio - Serious About Sound®