but you normaly have to make one if you buy it from wal-mart, I did, it only cost me 10$ and 18 cents!or you can get one at almost any pet store for 23-25$, but my brother bought one from the store, and mine ended up working better, i made mine myself, it isn't hard at all, just follow the instructions on thise thread http://cornsnakes.com/forums/showthread.php?p=574234#post574234
I made the second one on the second from last pagegood luck