help with audible.com free audiobooks

[paracefan2002]

hello. I bought a DLO ipod 30gb case for my video ipod. There was a card that cam along w/ it. It said i could recieve 3 free audio programs. However, when i went to check out, it asked me for my billing info, (i.e. credit card #, etc.) How do I get those free programs w/o paying for them??

-paracefan2002