I have picked up most of my driftwood at A Place for Pets in Burien but call first because sometimes the inventory is low. They typically have a nice selection of Malaysian driftwood. That said, Denny's in Kirkland and The Fish Store on Roosevelt in the U District are also good. If you are a GSAS member all three stores are GSAS Sponsor Stores and offer GSAS members a discount.
75 Gallon, 2X55W AH Supply CF 8800K, 1XMarineland Doublebright, 2X Marineland 350 Magnum; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0 36"/46W; 20 Gallon, 1X26W AH Supply LED kit; all with Press. CO2; (Calcined) Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)