I have a handful of different designs that I swap out. I've had a couple for over three years. The design is wearing off the edges, but other than that they're in great shape. Here's a link to a plain black leather one on amazon.
Dynomighty Men's Leather Mighty Wallet - Super Thin Lightweight Tyvek Billfold https://www.amazon.com/dp/B005XZYC1K/ref=cm_sw_r_other_apa_9LNlxbPNPNA2V
Tyvek wallets are best. Like this.