Accio Christmas spirit!
Set of 4 Harry Potter letters, $18.69
Includes a Howler, Harry's Hogwarts letter, a Ministry memo, and the Maurauder's Map (which isn't really a letter, but we'll let that slide).
"Always" Ornament, $16
It's a more subtle reference, so only true Harry Potter fans will recognize its significance. You can also get it personalized for $2 more.
Via etsy.com
Mini book ornament set, $24
The set includes tiny versions of each of the seven books. They don't open, so there won't be any tiny reading.
Golden Snitch ornament, $9
Thankfully does not attempt to fly away from you.
14 Magical Harry Potter Ornaments To Hang On Your Christmas Tree