Well the brands listed above do not have badminton shoes besides Yonex!! Are you comming to Seattle just for the shoes? You could just go to Vancouver and buy them.
There're no badminton retail store in Seattle area. There're individuals who sell badminton equipment. If you're interested in Yonex, you can get decent price from a authorized US Yonex dealer or players sponsored by Yonex. You'll need to know the shoes size you wear, since they don't carry them in stocks. PM me if you're interested, I can give you the contact info.
I will be visiting Seattle, and thinking buying some badminton gears there as things are usually cheaper in the States than Canada. So are badminton shoes same as indoor court shoes?