The Super Nintendo had a nifty accessory: the Super Game Boy. I always wanted one of those, but they were prohibitively expensive during their relevant period.... Then I got a Game Boy Color and all was right with the world. 

Retro Zone's new product is like the Super Game Boy but it works with the original Nintendo system. This bad boy also supports Game Boy camera and printer capabilities, meaning you can view your low-res images from your television [via Tiny Cartridge]:

The downside is that the RetroVision costs $130 and is handmade on order. Oh -- and audio only works through the NES if it is modded, otherwise you listen via the headphone jack on the cartridge itself. Hmm....