When I went to Michaels, the Heidi Swapp products were 50% off (and I used my teacher discount). I bought a Light Box :) Right now my daughter has it in her room. We may have to buy another one before school starts.
I've made some strips to use with my reading groups. I printed them on paper. It isn't quite the same effect, but they still work (and are a cheaper alternative). I can't get to my building where I have HUNDREDS and HUNDREDS of transparencies (because nobody uses the overhead anymore)!