Visit your local Home Depot, they have a nice variety of tool boxes, both plastic and metal that will do the job just fine.
+1. I used a plastic tool box for mine, modded with an aluminum plate on the side (for the SSR/heatsink) and a piece of 3/4" wood inside the bottom on which to mount terminal strips. I like the way it turned out and it's easily stored away.
__________________ Good Temp Control -----> Happy Yeast ------> Tasty Brew
I used the carlon 12x12 box. It fits everything but space is tight. I also went with the 1/32 DIN PID's to save a little space, that helps because those things are small. Once you get the wiring, relays, SSRs, outlets, etc in there, there's not much room left. Also, the plastic is easy to modify with simple tools compared to metal. The carlon boxes are thick durable plastic as well. I'd recommend them.