Glitch City Laboratories closed on 1 September 2020 (announcement). This is an archived copy of a thread from Glitch City Laboratories Forums.
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Ah…I am well aware of that problem, having experienced it myself when looking for extra Gen 3 cartridges. However, as two have been legit, there are indeed more legit copies out there. You could contact merchants directly before ordering and ask them to send a photo of their cart, and then reverse search it to reduce the risk of getting a fake. That's the best I can think of. Hope you find what you need in time.
I am in the US. The problem is, I've purchased ~8 carts over the last 2 years from Amazon and Ebay, and only 2 of them have been legit.
Off the top of my head, I think an Everdrive 64 with the transfer pack you use in Stadium can be used to do it, but I don't know any more than you to be honest. I could maybe answer some questions if you find one and don't understand it. Just don't post them as anything but patches if you do it here.
Also, Id love to dump the roms, but I dont really know how. If you could link a tutorial, that would be great.