Games as in CEs for them?
Dead Space Ultra edition: Usually £500+
Uncharted 2 Among Thieves Fortune Hunter Edition (wasn't a retail edition, was a competition): Usually $1000~ +
Kingdoms of Amalur Signature Edition: not sure of the going rate anymore. I'd pay $500 max for one though, considering they were $270 at release.
Kingdoms of Amalur Exclusive Edition (the one limited to 12): Last one sold for a lot less than $2500. About 6 out of the 12 managed to find themselves on ebay within the first month of release
Not sure which others, those are the ones in my mind right now though. Don't own any of them GRR! xx