The euroNes is the final project for Berklee College graduate and youtuber Corvus Prudens for his Music's Electronic Production and Design major. It's a 7 voice module which lovingly replicates the sound of the vintage Nintendo console incorporating an FPGA chip - upon which he designed his own CPU for better fidelity and faster response times.
It has 2 normal pulse channels, two high resolution pulse channels, one triangle, one saw and a noise channel. The module has MIDI and CV capabilities with pitch bend, vibrato, expression pulse width and portamento supported. You'll find more some sound examples on his Soundcloud page.
It's going to be around $150-200 and all he documentation has been made available here.