its called a cajon. you can get them at musiciansfriend.com or any of the other online music stores... guitarcenter.com... music123.com...
do some shoping and wait for sales. especially with shipping. but it should be free at many places since those cajons go for about $150 i believe.
option: take a large drawer or something similar in construction about 1.5ft cubed and one open space (or build one). the side opposite the opening should be some sort of flimsy plywood. now take a bat to one corner of that side enough to crack it, but not bust a hole through it. that area is now your snare. the center is your bass. an the other corner is your tom. and make sure you wear some baseball gloves to avoid splinters haha.
some here have seen a video i posted up of my brother and myself playing a song using that. it is very loud, and sounds like an actual drum set haha. but i think it was more of a fluke, because if we had to, i dont think we could reproduce it.