I played my SMS games on my Genesis, using the Power Base Converter. I got most of my games at yard sales.
Astro Warrior (missing case)
Black Belt (cart only)
Double Dragon (cart only)
Hang On/Safari Hunt (cart only)
My Hero The Sega Card
Out Run (cart only)
Pro Wrestling (cart only)
Rocky (cart only)
Shinobi (cart only)
Thunder Blade (cart only)
I think Astro Warrior I bought new at Toys R Us in the mid-90's for $10. Although it was from TRU, it was missing the front cover and plastic that held the front cover. My Out Run, purchased at a yard sale, had a sharpie spot on it beside the name. When I rubbed it off, it said "the niger", so I bought it from some racists that couldn't spell apparently. I saw another Light Gun, the Phaser, I think it's called for $5 at a Goodwill, but decided to pass. I really only recall playing Astro Warrior (so-so), Black Belt (a little above average), Rocky (could never beat Drago or was it Clubber Lang?), Shinobi (awesome), and Thunder Blade (pretty good game).