Monkeygift

I'm just saying that those are incredibly valuable in their country of origin. If he's willing to sell in the U.S. he may get a few hundreds but who knows?

Well, in Korea they simply can't be found so collectors that have those games are holding on to them like crazy. Only extremely high offers could "maybe" make them sell.

In Korea, this would easily fetch in the thousand $ btw.

That shop I go to (which is a gaming coffee shop also. Really cool place) has very fair prices for everything I've purchased. But trust me on that, anything on cartridge that was released prior to 2000 here in Korea is now insanely rare as the generation that grew up with that are now making good money and are going nuts hunting this stuff down.

Some rare stuff available in a shop in Seoul. Although all that is over 1K. The Sonic I think goes for like 2200$. Anything "cartridge" in Korea is now very rare and/or super pricey, probably beyond prices any foreigner's willing to pay.

There isn't. I live in South Korea and those games can't be found in any shops anywhere. They are at best in private collections and extremely sought after by locals and therefore fetch very high prices here.