There was an NPC price reset recently where leather went way down in price for a few days. I stocked up on Catskills, Sonoma, and Atlantic. I have some for sale on these shards, and you would have good success on any shard spamming at banks. Also try the popular trading forums with a "want to buy" message.
I saw a guy at a bank recently on Sonoma trying to buy spined at 100, horned hides at 130 each. Maybe prices are going up on animal hides with the recent nerf of bags of sending.
Edit: Typical prices on leather now are 8-9 each from the NPC's If you are selling, might be a good idea to wait it out while the price goes back up to where it was before the NPC reset.