I agree that there are very large variations in pricing on Pinside and Mr Pinball.
However, I have gotten several games from Eric (eabundy) in CT that are in the condition as described and are either under priced or at market value.
It really comes down to the seller and their motivation.
Eric seems to be in it as a hobby and not as his sole source of income so he is a quality seller and hopefully continues to offer great machines at very good prices.
Just find a reputable seller and laugh at the other sellers who buy low and sell high. Their prices will come down eventually if nobody buys from them.
just my thoughts
njg