I have for sale an arduinoboy I bought from Nex 2 years ago. I (poorly) installed it into an old jury-rigged case. It's got MIDI In/Out, however I only kept the MIDI In port on the case. MIDI Out can be added, you'll just need a female MIDI port and a soldering iron. It's also got a link cable from a 4-player adapter. It's in pretty rough shape, and will definately need to be re-housed in another case, and the LEDs could use a re-soldering. There may also be some loose/broken connections, so I wouldn't advise buying this unless you've got soldering equipment. I will send the construction manual via e-mail. I'm willing to sell it for 40$ + shipping.
You can e-mail me at [email protected].
Thanks