Where can I find some unique Harry Potter toys?

My nephew is really into Harry Potter. It seems as though he owns just about everything made that has anything to do with Harry Potter. I would like to find something original that he may not have yet. I don't have a list or anything of what he does have, but any suggestions could help. Thanks!

How about Harry Potter Science Activity Kits? There are about 15 different kinds available at:

http://homeandfamily.biz/store/harry-potter-activity-kits-c-22.html

Our TOYS R US has Harry Potter toys.

Here is the website:

http://www.toysrus.com

And for Canada website:

http://www.toysrus.ca