TRU SPEC Prefab Single 6.5" Subwoofer Enclosure Sundown SA / DC M3 - GP Car Audio
SPL Boxes SB212SV Dual ported 12" subwoofer enclosure at Crutchfield
Amazon.com: Bbox Single Vented 10 Inch Subwoofer Enclosure - Pro Audio Tuned Single Vented Car Subwoofer Boxes & Enclosures - Premium Subwoofer Box Improves Audio Quality, Sound & Bass - Nickel Finish Terminals : Electronics
Qpower Qbass Dual 12 Inch Heavy Duty Mdf Material Car Audio Subwoofer Enclosure Boxes With Shared Slot Port Vent And Dual Chamber Design, Charcoal : Target