I've never ordered from them online, but being a semi-Seattle native, I love their store.
It is two buildings of CRAP! It is a prop-builder's dream. If you make sets and props for plays, this store is for you. I can't even describe it. From rubber chickens to surgical tubing to typewriter returns to Mountie hats to exploding cigars to vacuum tubes to itching powder.
If you are ever in Seattle, it's a must see, on Market St. in Ballard.
http://www.mcphee.com/