>>22940415You can get cheap knockoff ones on aliexpress, but I'd rather play on my TV personally.
>>22940417It's just a standard CR-32 watch battery, replacing them is easy and they last like 25 years. All you need is the proper bit to open the cart, and you can get one of those for a buck or two on ebay.
>>22940419Do flashcarts work on the SuperGameboy? A GB/GBC/GBA flashcart is the only one that I haven't gotten yet.