Consider Wickett & Craig, Curwensville, Pennsylvania
http://wickett-craig.com/. They claim to make vegetable tanned leather & their product seems well thought of by serious leather users.
This is a relatively new tannery, built adjacent to the old tannery which is now a nationalterriblecontaminated site. I went through the old one twice, once age 6 when I loved the smell of the finishing room (fish oil). Got a tour about age 55, secretary had been in my Aunt Louise's class in school. Still had the locker room where Grandfather changed clothes. Sorry to hear that it went.
Anyway, Wickett & Craig is a good leather source. Ask them about that chromic acid treatment. Don't believe the Commonwealth of Pennsylvania will permit dumping hexavalent chromium into the West Branch of the Susquehanna any more.