Here in the Midwest, used A1000's could be had for dirt cheap in the late 80's. Usually bare bones systems, but once in a while - you'd get a complete system + a DKB Insider for $100 or less. I know I was paying $50-$75 on average. Brick and mortar as well as catalogue retailers were still selling refurb'd A1000's for about $350 but it came with a "full" 512kb RAM. Early 90's were good times to get people's A500's for the price of an SNES and A2000's too could be had between $300-$500. By the late 90's, the Amigans that didn't ditch the platform and that had nicer systems, were scooping up 060 boards and video cards for reasonable. By the early to mid 2000's, said Amiga elitists were starting to get rid of their stuff and that's when we saw the lowest prices on the best hardware. By the late 2000's is when I started seeing a huge rise in demand and thus, higher prices again (as if it was the mid to late 90's), only this time, you didn't have retailers selling the stuff as it was mostly second/third/fourth hand and people were still trying to strike it "rich" off of eBay.
Now, here we are - in a crippled economy where demand has slightly curtailed, but is still kinda high, the dollar is weaker - but Amiga stuff still fetches a relatively decent buck compared to any other classic computing platform that I'm aware of.