I also have a black label FF7, and it's a pretty funny story how I got it. I originally owned a greatest hits copy, but that one for some reason stopped working (though I never tried buffing it, which would probably fix it) so I decided to just start from scratch at the time and buy a replacement (I was at college, and didn't have my original copy with me). So I shopped around on Ebay, and found an actual black label in mint condition with the original case too. I don't believe the guy knew how valuable it was, because he was selling it for only 30 bucks.

I was like yeah, OK, I'm either gonna completely take this guy or it's a scam. I decided to risk it, and yep... it was a real black label in original case.

I don't know WHAT that guy was thinking, but I've played it all the way through, works fine, and so yeah... I got a 700 dollar game for 30 bucks.
I also own Suikoden and Suikoden II, the latter being 800 bucks new, and over 100 used. I also own Xenogears, which is pretty sought after today as well. I have Vandal Hearts and the even more rare Vandal Hearts II as well. I think that's all I can think of, though I'd need to look through my collection to be sure. I'm sure some of my Dreamcast games get to be around 100 bucks now.