a friend of mine wanted to buy 100pcs of these... they look like this http://www.racketboy.com/images/Gyromite-Cart-Comparison.jpg . i also was looking for famicom clones for him. i believe he wants to buy these in bulk too. he also wouldnt mind buying official units in bulk too. any advice is highly appreciated. thanks in advance!
In the image linked take note of the edge pins, the parts that are shiny. Notice the hard to see little extensions from the ends of them? Famicom Gyromite in NES carts have these little pins on the side. Non adapter carts have them in the center. That is the best way to tell.
those russians that sell the cheap flashcart offer adapters, but they aren't really priced that great, i don't think anyone offers a decent price worth ordering 100 at once
Found this doing random searches: http://stoneagegamer.com/nestofamicomconverter72-pinto60-pin.aspx Converts a 72 pin NES game to work on Famicom.