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, 1XFluval F&P 2.0 48"/59W, 2X Marineland 350 Magnum filters; 45 Gallon Tall, 96Watt AH Supply CF 6700K, 1X Marineland 350 Magnum filter; 30 Gallon Long; Fluval F&P 2.0 36"/46W, Marineland C-220 filter; 20 Gallon, 1X26W AH Supply LED kit, Marineland C-160 filter; all with Press. CO2 and (Calcined) Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)