An Apple IIc
If you read my Newly Digital post, you would know that I wanted an Apple IIc 20 years ago. (This was introduced in April '84 -- a few months after the original Mac.) So here we are in 2004, and eBay just so happened to have one available. So, I bought it.
$50.51 for a functional Apple IIc with color monitor, printer, a set of nice games (Flight Simulator, Infocom's H2G2), Print Shop, AppleWorks. Even a genuine Apple mouse to go with it. Even EA's Music Construction Set -- the predecessor to GarageBand (ok, that's a stretch). Quite a deal. Not bad for a computer that initially sold for $1,295 retail.
I don't know what I'll do with it. I'm sure someone's ported Linux/Mozilla/MAME to it, but no... I'll stick with good ol' ProDOS. I just gotta find a copy of Lode Runner for it.