Serving as a precursor to the Game Boy Player, the Super Game Boy sold for $60 in 1994. Appearing like a tall SNES cartridge, the attachment could playback Game Boy games with a limited color pallet. Yet another useful Nintendo peripheral I regret passing on.
For those who own(ed) one, do share your experience with us lesser creatures in the comments. Was it worth it? How were the colors? Were the extra SNES effects a gimmick? Spill it.