44AMP, when I lived in Seattle, between the State sales tax and the county and city (or just county, not sure) taxes, the net sales tax was around 9%, if not over. This was in the 2000-2001 timeframe.
I just looked it up, and as of Feb 2012, Seattle sales tax was 9.5%.
Link:
http://www.yelp.com/topic/seattle-sales-tax-rate
Another link, for the rest of the state's area sales and other taxes:
dor.wa.gov/