Easiest way to do it is to go to a video game store that carries a machine that plays super nintendo, nintendo and genesis. I think they go for about $60.
The video game store in the basement of the Atrium at Bay (Bay and Dundas carries it)..... so does the Microplay in Newmarket (Bayview and Mulock).... pretty sure the video game store on the west side of Yonge near a dollar store around Yonge and Wellesley carries them too.
You can order them online as well.
While not the same machine that I was talking about above here's an example
http://en.wikipedia.org/wiki/FC_Twin_Video_Game_System
or
http://nintendogameconsoles-david.blogspot.ca/2011/02/retron-3-nessnesgenesis-triple-system.html
just google the nintendo clone and you will find this kind of stuff.
Games are easier to come by EB games has some but their selection tends to be weak compared to the other three places.
In fact those stores may also have the original machines as well. The clones might be cheaper and new.