I am having a hard time finding any on ebay that say .com.cn. They all just say .com.
I did find this one on Amazon that says .com.cn and the price is comparable to ebay:
There is also this one that comes with the SD card (that i would replace) but it is $30.
https://www.amazon.com/Update-Version-R4ISDHC-Memory-Nintendo/dp/B08YJ8R4FS
In my experience, GBA games run awful on the DS with that emulator. I've got this card: https://www.amazon.com/dp/B092HQ48V9?psc=1&ref=ppx_yo2ov_dt_b_product_details
recently and 2 other different ones and the GBA emu is trash.