Creating a Finger Joint Box : 4 Steps - Instructables
Joint Box - Etsy
LeMotech Junction Box, ABS Plastic IP65 Waterproof and Dustproof, Universal Electrical Enclosure, Outdoor and Indoor Project Box 10 x 7.9 x 3.1 inch (255 x 200 x 80 mm) - Amazon.com
A Full Guide to the NEC Code for Junction Boxes | Polycase
Carlon 4 in. x 4 in. x 2 in. Gray PVC Junction Box E989NNJ-CAR - The Home Depot