PSP GO m2 Adapter soldered to MemoryStick (120GB) : r/PSP
SanDisk M2 16GB Memory Card+Adapter For PSP Go (Super Rare Collector's Item) | eBay
SONY PSP GO M2 Memory Card to Micro SD Adaptor £26.00 - PicClick UK
Another tip for the M2 Dummy Cable for PSP Go....Strip the battery shell, and no case mods are required. Peel tape, put in new battery and its stock. : r/PSP
Lexar 16GB MEMORY STICK MICRO M2 CARD For SONY Ericsson Phones PSP GO Super Rare | eBay