Price of a grow tent?

Was wondering roughly how much a grow tent would cost at a hydroponics store? 3x3 preferably . I might purchase one but if its too expensive i think i would rather build my own box for cheaper.

Any prices or information help

If they are too expensive at your local hydro shop try looking on ebay, i'm thinking of also purchasing one from there. I saw a few for under $100 bucks. Different sizes to fit your needs.