Unable to buy a bear mount

Recently I bought a Platinum Plate Agile Ice Bear for my barb. Now I would like to buy the same mount for my BS with enough trophies and gold in the inventory, but it’s not possible. Hammond the Bear Tamer doesn’t react on anything. Is it just allowed to buy bear mounts for one toon per account?

Both are Huskarl with Clan Vigdis.

Tx a lot for help.