Models: Ebay, Hobby Lobby, Michaels, other places online like Jimnohio
Supplies: Hobby Lobby typically. The local center that has our local Hobby Lobby has an auto parts store on the other end, so I duck in there to get paint and primer. Also LHS if I need something specific.
I've gotten into slumps before. I either switch genres for a while (sci-fi, anime, etc.) or I do something else with my time like catch up on my PC gaming.