Single 12-Inch Ported Subwoofer Box Car Audio Stereo Bass Speaker Sub Enclosure - Walmart.com
SPL Boxes SB212SV Dual ported 12" subwoofer enclosure at Crutchfield
Atrend 6 Hole 10" Subwoofer Enclosure 3 Front 3 Up Firing Sealed Sub Box 10H6 - Walmart.com
6-12'' Sealed Poly Sub Box | Rhino Bass Box
Qpower Qbass Dual 12 Inch Heavy Duty Mdf Car Audio Subwoofer Enclosure Boxes With Shared Slot Port Vent And Dual Chamber Design, Charcoal (6 Pack) : Target