Some things that are exceptionally rare will sell for insane prices (DKB3128, Z3 Fastlane w/ RAM upgrade, etc..).
At the other end of the spectrum are things like stock A1000 CPUs, most games, mice, SIMMs, "Amiga formatted Harddrives", and "AMIGA xxxxxxx 'manual only'", etc... These rarely sell as they aren't worth the cost to ship them.