Originally Posted by kenyee
You can also do the strobist style one using a cardboard box and tracing paper...even cheaper and folds up easily.
Be aware that if you try photographic highly reflective objects such as pearl jewelry, the reflections will show your lightbox is fairly high detail :-p
I saw the strobist one but it's awful flimsy. The one I linked to doesn't fold up, but he recommends not gluing the legs so it can be disassembled and easily stored.
Most of my use will be 1:24 scale models.