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Alas, there are no VM codes for MF cells, just gun ammo, but if you scav around you should be able to find a decent stash. I know there's a bunch on top of the belltower-ish building in Puesta del Sol South (not to be confused with the actual belltower used in the Gala launch). There's also a VM code for a holorifle upgrade up there. Here's a list of where all the codes can be found: