id say most ds flashcart brands, if not all of them are made in china (r4/m3/itouch definitely are)
i would avoid the ones with like springs for the memory slot cause those will be the first things to break
I think cyclo is based in europe, not saying they make them there but they might
as for memory Ive gotten some knockoff SD cards and they were shit, stuffs so cheap nowadays anyway no reason for it