140 mp3's available

I have over 130 mp3’s available… I found a way to have multiple mp3’s in one product item and enable the costumer to buy only one and only receive that one… without having to browse individual product pages.

It does work in 1.3.5-SP2 But I can’t figure out what to put the price as, when I put the price as $0.00 the price doesn’t go up no matter how many you tick off…I tried $0.01 and that works but it’s tacky…Solution?