Well redrumloa was selling a basically new refurbished Amiga for $150 shipped. Which I think is well worth it considering it's basically new.
I have looked on ebay and the A1200's I have seen are at least $130 now with quite a bit more auction time left.
There is one place I saw on the net called Visalia, I think, that is selling A1200's with a 6GB internal hard drive, basic software, 2mb ram, for $200 or so.
As far as getting a cheap Amiga, well I really don't want some dirty, yellowed, tape residue covered system. The cheap ones I find usually are in this type of conditon.
So far I haven't found ANYWHERE that seems good for Amiga computer purchases, other than ebay.