If you are willing to drive a bit outside Seattle there are some good shops.
Seattle Ski in Shoreline
Sturtevant's in Bellevue
Sturevant's in Puyallup (bit further of a drive.)
Monkey Rides in Enumclaw (definitely a bit longer drive, but they have tons of quality gear.)
Bakes Pro Shop in Issaquah (Tent sale this weekend through next weekend, 25% off 08-09 gear, 50-70% off 07-08 gear.)