I have a R.O.B. and I would like a set of Robot Block parts to complement my Gyromite set. The parts consist of two hands (left and right), five block holders and five differently-colored blocks (white, blue, green red and yellow). I don't need the cartridge or original box.
The Famicom version isn't as rare though if that helps. I got mine quite cheap and I've seen them pop up now and then.
That's why I'm not looking for "Stack-Up" parts, they are very :o expensive.