JL Audio ACP112LG-TW1 MicroSub+™ single 12" powered subwoofer enclosure at Crutchfield
CS112-WXV2 - JL Audio 200W WXv2 Series Single 12" Loaded Subwoofer Enclosure
Amazon.com: Pyle Slim Subwoofer Box System - 400 Watts, Perfect for Mount Car Truck Audio Powered Subwoofer Enclosure, High Powered 8-inch Woofers with a Non-Pressed Paper Cone - PSBS8 Black : Electronics
Amazon.com: Atrend 10SME 10” Single Sealed / Shallow Mount Subwoofer Enclosure : Electronics