I'm on my second in 4 years for this Carhartt wallet, I liked that it didn't have as much cheapo or fake leather so it wasn't getting weird dark marks from oils and shit all over my cards like my previous wallets did.
Though that wallet is currently retired/back up as I got a wallet from a US company Grip6 during a seconds sale they recently had. I really like it, nice and slim, Canadian bills don't fold well for it (or, fold well in general) but I almost never used those anyway...
US bills are slightly smaller than Canadian ones I believe.
I bought it at Tractor Supply Co. Amazon has them too.http://www.amazon.com/Carhartt-Canvas-Passcase-Wallet-Brown/dp/B005FJ273O/ref=sr_1_9?ie=UTF8&qid=1412600140&sr=8-9&keywords=carhartt+wallet