Nintendo and Sharp had a close relationship back in the days of 8-bit gaming. In the world of Famicom, Sharp is best known for creating the Twin Famicom, a single console that had both cart and disk ports. A little less know, but still highly sought after item, is the Sharp C1, a combination TV and Famicom.

The Sharp C1 is hard to find with its original controller.

The C1 came with a Famicom built into its base, and unlike the Famicom and Twin Famicom, it had a controller you could plug into the base. Just like its NES counterpart, 19SC111, the C1 wasn't a very popular item. But unlike the NES version, the C1 sells for a lot more money today. An unboxed C1 with the original controller can sell for as much as $600.

Sharp packaged with the C1 the only licensed multi-cart made for the Famicom: the Donkey Kong 2 in 1. The two games were Donkey Kong Jr. and Donkey Kong Jr. Math. For whatever reason, the 2 in 1 cartridge isn't as rare as the C1 itself, selling for about $30.

Sharp's DK Jr. and DK Jr. Math.