It’s not often that I find Genesis games out in the wild but when I do they are always a great deal.
These two game from a local video game store (Gamerama) that I check in on from time to time.

Both are missing their manual’s but at $5 they are still worth while. The Batman is in good enough shape for the collection but the Street Fighter 2 has some marks/wrinkles on the sleeve along the top. I may just play it or trade it away. (assuming I get off my butt and post my games for trade)