Most reviews are somewhat short and spotty, due to the casual and free nature of emulation. That said, Brandon Widder has written a good piece for Digital Trends which reviews the best emulators for various systems, including the Sega Genesis.
A Sega Saturn Emulator is available at the emulator zone. You will have to download the file, then unzip the folder that the emulator is in. Then, you will have to download games to play. You will then have to download a virtual clone drive(virtual disk drive) so that you will be able to play the games.
You could find the current value for an original Sega Genesis system online, especially on the forums of the official sega website, or by looking at what others are selling theirs for on eBay or Amazon.
In some (but very few nowadays) arcades you may be able to find it. It is also availble for the PlayStation, SNES, Sega Genesis, Sega Saturn, (Sega Genesis) 32X, and PC.
Sega Genesis power cables can be purchased online at Amazon, Ebay, and the Nintendo Repair Shop. One can probably also find and purchase a good used one at a pawn shop or thrift store.
That's easy just download the following: WinRaR, Fusion emulator. Then go to CoolRom.Com and go to the ROM FILES go to sega genesis or master system then go to the S section and find Sonic the hedgehog 2 click on it wait for the download link to appear download it and now use WinRaR to unpack both the Fusion emulator and the game then run th emulator and open the game by choosing genesis or master system ROM and your set to play!
You can download the app for it on an i-phone. Or you can play it on the X-Box 360 when you get Sonic's Sega Genesis.
Reviews for Nintendo DS Emulators for the PC can be found at The Emulator Zone forum or Gameyum. These website provide detailed and insightful comments and comparisons between the top emulators available for the PC.
The Sega Genesis game you're referring to is called "ToeJam & Earl". It follows the adventure of two alien protagonists trying to find pieces of their spaceship that have been scattered across Earth.
Sega Genesis games can be bought on online platforms like Ebay, for example. The advantage of such platforms is that many people from all over the world sell their games, which increases the chance to find even rare or normally not available games.
The great thing about Dreamcast is that it will read a regular CD that you can burn off your computer. All you need to do is find a site with the emulators you need, burn them to disc (in Dreamcast format), and then game on! Just make sure you burn the emulator to one disc and the games to a separate one.
emulator-zone.com visualboyadvance is the best.
on emulator zone if you want a wii emulator