yah you should be able to get them at a good price there,get your self a little fan at wall mart so you can move the air around tooi think im going to start out with two of the strongest ones a home depot if they are a good price.
Sorry, but a 250w hps in that small of an area is going to be WAY too hott! If you add a couple of cfls you got yourself an oven. Thats a samll enough area that a few cfl's in the right light spectrum will do the job. Let me clearify that, it will do the job as in make buds, but the chances are they wont be the most dense of buds. Good Luckid buy one 250 w hps would do you good,with your size box,a couple of cfls