I made my own lightbox for a few photos. I used this tutorial:
http://blog.makezine.com/2006/07/27/diy-light-box/The pictures came out okay, but it was hard to fit a lot of my products in the box. I tried again with another piece of white fabric instead of the posterboard, but it still wasn't great.
Last week I just used thumbtacks to pin up a piece of white fabric above my kitchen table, and draped the rest of the fabric over the table. I think this would work really well if you have a lot of natural light in the room you're using. It worked okay for me, but my apartment has very little light so I had to do a lot of editing afterwards.