Bridge Town Hobbies and Games is the only place that I know of. They are on Sandy Blvd. And they really have a limited selection. I live in the just north of Portland in Washington State, and I usually buy my armour from Ebay or Directly from GHQ
Thanks for the information. Like yourself I'm buying my microarmor from GHQ, but since I was going to be in Portland I didn't want to miss the chance to browse a new shop and add 10 pounds to my luggage.