Where can I download Weird Al's "Pacman" and "It's Still Billy Joel To Me"?

I’m a (self-described) hardcore Al collector and I can’t find either of those songs. They’re early songs that weren’t on any album of Al’s. He recorded them on tapes and sent them to the Dr. Demento radio show when he was a teenager. Dr. Demento has released “Basement Tapes” and “Al Rarities”, but I can’t find them. Al has never released these to the public, and The Pirate Bay, Bitsnoop and the like have failed me. Does anybody happen to know where I can find these? Thanks!