Humanist Merchandise 

The following are a number of websites where you can purchase non-religious goodies such as 

http://darwinuk.com/
UK based merchanise website which is great for jewellery.

http://evolvefish.com/
U.S. based freethinking merchandise website - great for badges, t-shirts and jewellery. 

http://humanism.org.uk/store/
Good for all sorts of stuff.