First Amiga *I* owned is my A2000. Got it at a large flea market here for $20. Didn't use it much since it I didn't get a monitor with it, and the composite video out on it is pretty much a joke.
About a year later I happened to be talking to an acquaintance who said he had an A4000D. Bought it for like $40 or something. He new not what he had. :-D
My A500 I borrowed from another acquaintance. He had me clean it up for him after he'd neglected it (I think he spilled bong water in it or something, what a mess!). So I gave it back and told him if I ever saw it like that again I'd take it away from him. I borrowed it from him a few months later to test out some A1200 motherboards I bought off eBay (DOAs). Sure enough it was jacked up again. A month later he moved away, and never got it back.