LAB PreFab™ 1.00 ft^3 Sealed MDF Enclosure Box for Single 12" Round Car Subwoofer
Amazon.com: Skar Audio AR1X10V Single 10" Universal Fit Armor Coated Ported Subwoofer Box with Kerf Port : Electronics
Tru Spec Vented Prefab Single 12" Subwoofer Enclosure for Sundown SA Series 12v2 - Walmart.com
First Subwoofer box I ever built. $0 budget just using scraps around the shop. Boss told me not to build a box it's cheaper to buy a prefab, and I took that