I've won a few interesting things on eBay, a few "unpublished" vocal scores which at the time were hot tickets, now everyone who is into "unpublished" vocal scores has acquired them, so it doesn't seem so special anymore. I go to eBay when I can't find things on Amazon or Footlight. As a matter of fact, today, I've been looking for "Hooked on Classics" CD's, as they are WAY out of print and for some idiotic reason, I'm hooked on them again! Reminds me of my childhood, plus they are good for excercising to.
Speaking of "Hooked on Classics" I know a long time ago, they actually published sheet music for some of the medleys and I believe it has been long out of print. That would definately be a garage sale find!