I think you just need to check those places often, they get new stuff in on a daily basis from all over - donations, schools, old closed down office buildings, etc. I've seen Model M's at Goodwill before. This one was at the bottom of a bunch of cheapo keyboards. Dirty and grimy, most people just assume it's an old piece of junk. My wife goes to these stores all the time - I've since told her: If the keys click, buy it! Especially since they are usually priced at only a couple dollars...