Its pretty simple to make and cost less then 10 bucks total to make.
I bought a stainless steel bill fold and a stainless steel business card holder off of ebay both together cost like 10 bucks.
Then i glued them together with JB weld fist is used some sand paper to ruff up both surfaces, you could weld it if you have the tools but the jb wield has held it quite well for some time.
There you go a cool looking minimalist wallet that also protects your RFID credit cards from being unlawful scanned by thieves.
It holds my drivers license 1 debit card 1 credit card and my paper driver insurance card, and what ever cash you can fit into the bill fold