Well, most certainly there are a lot less around. Some of them have been stuffed in dusty lofts, or forgotten somewhere. But most of the have certainly been trashed, and that's a real shame
As for general availability on the market, IMHO, people need to stop hogging consoles. I mean, who really needs 8 A1200, a few CD32 and 6 A600 or such, when he/she's probably going to use only one?
I love Amigas too, but one of every model is enough for me, even if just for display
And that makes the market prices skyrocket.
...And it's also the reason why I don't still have an A400D