We bought a number of the pins for gifts. They are small, but cool--bought my nephew a Prefect pin, and my niece a Hedwig pin. They sell pygmy puffs at Zonko's, I believe they are still under $20. My kids love their pygmy puffs.
I have a Ministry of Magic mug (but the gold wore off pretty fast) and a Dumbledore's Army mug, they were both under $20, depending on the age of the recipient.
They also sell the Bertie Bott's beans (and some other candies) in bulk, you get a plastic bag with Honeyduke's on it, but it wouldn't say Bertie Bott's. Much better value if you are merely after the candy, but it's not as much fun without the "legend" that says which flavours are which.
Yeah--I'd want to pick out my own wand too.