I can't remember all of them, but a couple of weeks ago Honeydukes (in the Wizarding World) had several pumpkin items in the pastry case. I got a pumpkin pastie (so good!), but I think they may have also had a cupcake, maybe a bread, and fudge that were pumpkin flavored. I didn't check anywhere else, but hopefully someone else can chime in!
Plus, the Wizarding World always has pumpkin juice and -- IMO the much better -- pumpkin fizz.