Yes of course we have them here too but like Luigi says, M5 is the smallest available size at DYI stores, specialized hardware stores and even "inter-business" hardware companies.
I bet you're working on a Nintendo Luigi ?
Zinc coated, is that shiny "silvery" looking ? If so I'd like a couple if possible yes !

20 mm length would be great if possible Luigi.
My Mario Bros. CP needs 12 of them...not sure if the coindoor needs them too, disassembled it SO long ago...
I think they actually are the same....then I would need 11 more. I even forgot about how the mech was mounted....