Leather Sources

Here are three leather sources that I know of, not including Tandy.
I'm also adding these to the Resources: Making Armour page.

Springfield Leather: Family owned and operated leather supply store located in the USA. They do carry sole leather, which is armour weight. They also sell tools, beads, hand-painted feathers, exotic leathers... Their catalog is pa ked full, and half an inch thick. I have ordered from them, and the customer service was excellent.

Brettun Leather: Leather supply store based in Maine. From their website : "We buy our leather and other products from leather goods manufacturers and tanneries throughout New England and around the world, and help them reduce excess inventory.  We also help them avoid sending good leather to the landfill.  The end result is that we are able to offer high quality leather and craft items to you at low prices." They also offer free shipping to the contiguous 48 states, and do their best to offer it to customers in Alaska, Hawaii, and the Territories.
They also sell supplies to restore and repair steamer trunks, and have information on restoring them as well.

Weaver Leather: Leather supply store based in Ohio. The heaviest leather I could find was 13-15oz saddle skirting.