You can build one for a few bucks using PVC, an old sheet, some different colored poster board, and some tape.
or you can buy one on ebay, like I did, which is a steal - cause it comes with lights and everything. I think I paid < $50 for mine.
I built my own- 3ft square. total cost $15. this includes a white and a black sheet for the backdrop.
they sure as heck ought to. I have 3 60 watt lamps lol do you have any overhead lighting??? sheesh dude.