Are they hard to get like 10 of them?? Does any store sells them??
Wow. It's one thing if he's set on doing this, but Knightwarrior doesn't seem to even understand the history of what he's looking for. Mr. Idiot - if you're still reading, here's a quick FYI on what you're trying to collect:
1) Only a handful of games were released as Sega Cards.
2) Most of them were released early in the SMS's product life. We're talking, like, '86-87, except Spy vs Spy came a couple years later.
3) Therefore, they're rare as hell, although cheap, because nobody is particularly interested in them.
4) If you want cases, you'll have to buy complete games for $10-20 a piece. Nobody has amassed a collection of empty cases and I don't think I've ever seen empties sold as a lot.