I wish they had a GW store at every location here in America. I live in Eastern Virginia (Hampton Roads) and would have to drive for 2 or more hours to get to one.
I get my stuff from Hobbytown, and another local gaming store called Atlantic. White Dwarf is only available in a couple of spot... Most people don't even know what I am talking about when I ask.
Although you can buy Black Library stuff at any of the book stores...