Depending on how much time you have to organize before this event, and depending on how much space you have in that booth and whether you want to go to the bother, how about having people donate music CDs, VCR movie tapes and DVD movie tapes and then sell them?

Now that some people have graduated to Ipods, they might have no further use for their CDs. Ditto with VCR tapes- or at least that's what my daughter tells me.