I have an actual MK3 CP from a dedicated machine.  It has the buttons, joys, plexi and all the wires.  I'd let it go cheap as well, but remember MK has a wood piece, then a metal piece and finally a plexi cover.  I'd let it go rather cheap (say $60) but the shipping might be a bit crazy.
Open to anyone, I'm in TX if you would like a pic up and save on shipping.  Email or PM me.  (take out the dog)