My list of hiking stores in Seattle:
REI (of course)
Feathered Friends (across the street from REI)
Outdoor Research factory store– 1st Ave So, near Safeco Field.
Second Ascent– in Ballard, new and used gear. Takes trades too. My favorite.
Outdoor and More– check out the upstairs and back room for deals. Not too far from REI on WestLake Ave.
Pro Mountain Sports on University Ave. — best selection of true UL gear.
Patagonia — 1st Ave near the Pike Place Market
Federal Army Navy Surplus (down the block from Patagonia)
Marmont Mountain Works (Bellevue)
Outdoor Emporium– more fishing and hunting, but has a lot of rain gear and DriDucks– near Outdoor Research on 4th Ave So.
North Face– downtown on 1st Ave, University Village too
GI Joes— chain store. More fishing and hunting, but does carry some Marmot, Mountain Hardwear, North Face, and many accessories. LOTS of shoes.
Big 5 — chain store, cheap accessories, often has sunglasses, watches, LED lights, knives, and shoes on sale.