Mbo - it sounds like you tape would be rather popular. Why don't you stick a copy in the Auction?
Or better yet, patch your stereo into your computer, record the songs as .wavs, then burn those onto CD as CD-Audio files, and put that in the auction? If you don't have a CD burner, have someone else burn one for you (I've got the setup, and would be willing to do it for you, but I don't think I'd trust the USPS with a master.)