Anyone know where I can find a good famicom rarity guide/list?
No.
:D
Seriously, I'd like to know one, too.
Eh, I have only seen NES rarity guides. I'm sure there is a good Famicom guide out there albeit in Japanese probably.
manuel must find and translate one. :-* No, there aren't any. I don't get the interest in them. Just watch auctions and you'll find out which games are rare and which are common pretty quick. We do have a thread on here with a rare games list.