If you can find one, you have to factor cost. the good games are usually going to be collector items, and therefore really, really expensive (considering they're all used, old games).
My honest recommendation: Get a SNES Emulator, and try out the SNES experience on PC before committing to buy. And even then, a SNES emulator is free, Rom's (the games) are easily found and downloaded for free, and honestly you'll probably have a better time going that route. Saves you money too.
So in the end, do you want a collectors item with a limited supply of games, or to go the virtual route? Then again though, I've been playing emulators since i was a teen, so i'm kinda biased.
Also, for those of you who say that's copyright infringement, I believe the SNES and it's Roms were no longer covered by copyright law, and therefore are legal to download and use. But then again, I could be completely wrong. Might wanna check in on that before going the emulator route so you can't get hit with piracy