There's a nice edit feature btw. Although I doubt you would even want to pay $50 to play N64 demos (which are all pants) on the real console, I'll entertain your post.
Doctor v64 and such devices are vintage and very rare. Some might ask why SNES consoles in good condition go for £50 on eBay when you could get a PS2 for the same price. I think it's kind of obvious.
If you don't want to pay for the service, then I advice getting a TV-out card and an adapotoid (meaning you can play the games with a real pad on your television).
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“A commonplace man marvels at uncommon things; a wise man marvels at the commonplace” - Confucius