Problem with a deal (mods - correct forum?)

[backguard]

Just wondering how the DP community would handle this. I bought a big group of games from someone yesterday. I was told by email that there were about 1000 games and a bunch of manuals. Asking price was 4500. When I stopped by I looked things over but not particularly closely. I saw mainly saw nes commons (8+ copies of golf?) with some nice rares in there (mermaids of atlantis, power blade 2, dw4). I didn't price it out b/c it would have taken a couple hours, it seemed like it was a decent deal and the person seemed trustworthy so I didn't worry about overpaying.

Now, the person is contacting me wanting more money. I paid 4300 and got the carts. Today I get an email from this person asking for 500 more. I really don't want to be a #@$ about things. I think I got a good deal (even though i haven't had a chance to do much more than see what some of the titles are), but he seems to think that i got too good of a deal. its not like i was (or am) trying to rip him off.

any suggestions? shell out 500 as a show of good faith or something? forget about it?