Might as well just buy a PC-Engine.
While the connector is wider, the extra space is filled in with a piece of plastic.
I was looking arround recently on ebay and arround Japan (No, I'm not there but I have a firend that lived over there not to long ago and he would pick up stuff) and could not find one for under $70. It that the going rate? I'm talking about Core Grafx, not the orignal PCE w/o A/V.