Which stores carry Grey's Anatomy merchandise?

I'll be going to the States in about 2 weeks and one of my plans is to get some Grey's Anatomy Merchandise. I know everyone else buys their stuff from shopabc but that's not an option for me. Too many problems at customs and too many taxes to pay. So I was wondering if any of anda know places that might have some Grey's Anatomy stuff in stock. I'll be visiting Los Angeles, Houston and Chicago.

Thx in advance!