We got back very early this morning. The Universal Store at City Walk had some HP merchandise, but not nearly as much as in the parks. There was a decent selection of shirts, accessories (lanyards, headbands, scarves), and keyrings. I think there were full sized pygmy puffs. I do not recall wands or robes, but we were not looking for those things.
The City Walk store was not very large, and had things from most of the IPs (Seuss, JP, DM, HP, etc), so not a very large selection from any one IP.