I have a supplier who I buy leather file folders through (we personalise them by embossing), but they are based in the UK, they are called Lichfield Leather. From your post I wasn't sure if you wanted to buy them wholesale in a large quantity or a small amount for personal use, if it's the latter then I could email you the pictures and pricing info of the ones I have, we carry 2 types (which I have just realised aren't on my site!) but anyway, one is a A4 size which holds pad (it has ring-binders) pens, cards and even can hold a phone and zip up completely to keep loose contents inside and the other is much thinner, holds A4 pad, (which slip in a cover - refillable) pens and cards and has a snap loop closure. The second one is more popular, but I like the first one because loose stuff doesn't fall out!
If you want to buy in greater quantity, I can dig out the details of the supplier, they are very reasonably priced and shipping is free.