Originally Posted by krimson
Other then that. I think the $2-$3 per game is about right, but only if you sell them 1 by 1. Selling as a bulk, they are worth much less.
I'm not a regular follower of NES prices. But I would think he could manage an average of $2-$3 for a big lot and more like $5 if he were to deal with the hassles of doing it individually (And assuming it's not filled to the brim with common junk that nobody wants; if he had good taste back in the day it will likely be beneficial to the resell value).
For instance, a quick check of Ebay shows an auction for 22 loose NES games. Nearly 8 hours left to go and it's at $50 after 27 bids. It's mostly very common (Many of which are fairly undesirable) NES games (Although it has Bubble Bobble, a fairly common but in demand game which is certainly helping keep people interested).
Easy to say that a lot of 100 games will have a few similar games of interest like Bubble Bobble. And who knows, there might be one or two really valuable games that would balloon the price significantly such as Menace Beach or Flintstones: The Surprise at Dinosaur Peak or the very rare and in demand Bubble Bobble II.