Erik sends us his "Decadent Minimalist One" Kickstarter, "a minimalist wallet that is machined from a single billet of 7075-T6 true aircraft-grade aluminum: No screws, no rivets, no straps, no elastic, no velcro, no rubber bands, just metal."
It's $40 for a wallet, and though all Kickstarters carry the risk of you getting nothing, Erik seems to have some experience seeing his projects through.
It is available in 4 anodized aluminum finishes. Holds 1-8 credit cards securely with no straps or fiddly parts. Elegant minimalist look. No moving parts! Can be custom laser-engraved with your name and email address.