Super Mario RPG is the final Super Mario Bros. installment on the Super Nintendo Entertainment System.  Its full title: Super Mario RPG: Legend of the Seven Stars.  It is an RPG style game, the first for the Mario series and was helmed in development by Legend of Zelda creator Shigeru Miyamoto.  While the SNES title did not have a sequel on any new Nintendo console, it led the way for such game as Paper Mario.  The character of Geno, from Super Mario RPG, also appears in Mario & Luigi: Superstar Saga but is credited to its creators at Square Enix as opposed to Nintendo of America who developed the game.

The Legend of the Seven Stars can be played three ways nowadays: Via cartridge, via the Wii Shop Channel or via emulation software.  The latter is illegal, so avoiding it is the easiest way to stay out of trouble online.  However, thanks to the Nintendo Wii Virtual Console, you can purchase Super Mario RPG for download so you can play anytime you want.  It is 800 Wii Points and can be played with the Classic Controller.  If you are looking for a hardcopy SNES cartridge for the game, you can find it online via sites like eBay and if you are lucky, at garage sales or video game stores.  However, since the game is hard to find, you may end up spending more than just splurging on the game download via the Wii Shop Channel.

Depending on how you want to play, you can spend anywhere from $10 to $100 and up to get a copy of Super Mario RPG: Legend of the Seven Stars.  If you still own a SNES, and you want the SNES cartridge for your collection, you can find it various places online.  If you take your time and bid carefully, you may be able to get the cartridge for around $50.  If you are lucky, you might even be able to find a copy at a garage sale or yard sale for cheaper.  If you cannot wait or you just do not want to spend that type of money, you can purchase the game immediately via your Nintendo Wii and the play it on the Virtual Console.