I visit Amibay daily and I can say recent
MK2 including SCSI module has been offered for 700 EUR.
MK3 prices are 800 EUR and more. But of course people try first some high prices and if no interest they go down or wait for a better time (right now the vacation time is not the best for selling).
I bet the ebay is the best for those who want the best money for their HW. On the other hand Amibay or other Amiga forums makes bigger chance the sold HW goes to good hands ;o)