I suggest using a Retro Duo, since they're smaller and less rare. They're about 1.5 times the price, but I've heard they're usually worth it. However, if you want SMRPG to work, use a SNES Mini.
nooooooooooooooooooooo! I was gonna get it! Don't the new retro duo's play smrpg? At some point, I think only with the new mobo models, they revised it and allowed those games to be played n' stuff.
FC Twin is WORSE than a Retro Duo. A Retro Duo will play the first board revision of SMRPG but not the second IIRC. A SNES Mini is the best way to go for compatibility. There are lots on eBay, it'll just cost you a bit more. OTOH, the Retro Duo IS smaller, and worked out pretty good on other portables.
$50?! That's such a ripoff. They're only worth about $30
EDIT: Then again, it depends what he got with it. If it was the base system only, then it was a ripoff. If he got the cords and two controllers, then it's about right, and if he got one controller and a game, then that's pretty good.