I've always gotten pieces of furniture from garage sales and CL and things like that. A lot of times there are offices closing down selling some pretty nice cabinets for pretty cheap, and I've gotten some of my favorite terrarium/aquarium stands this way, just put 2 next to each other for the larger stuff like an AP12. If you want to buy something brand new, ikea has some cabinets that would match the aesthetic of AP pretty well.