I've sold my coins at $10 each (the rarer/exclusive ones at $15)
While I understand the super rare ones like Grimlock sell for more, I don't think that the regulation toys of the past couple years demand much more than that - $10 covers the "I have to spend a little bit of time going to the shop to buy a padded envelope to mail it to you"
Plus I don't think you're the type of guy who will try the "OMG SUPER RARE IRONHIDE COIN NOT KO MINT MP27 $50 LAST ONE!!!11!" routine