Well... I don't know of anny place that have check on resonalbe Amiga hardware so the best way would probably be to check multiple sell places over a substancial time.
If that isn't an option then put in what you concider a low offer on things and check the reply, try to poke in what a resonable offer might be if the person find it too low.
You can of cause also ask around on places like this if this and that is a good offer or not... most ppl are more than happy to help if they can but let at least 4-5ppl reply before you decide to buy.
