As long as the seller ships the item to washington - the buyer will not be taxed.
This should answer just about all your questions:
http://www.nolopress.com/article.cfm...1/277/167/ART/
"If an online retailer has a physical presence in a particular state, such as a store, business office, or warehouse, it must collect sales tax from customers in that state. If a business does not have a physical presence in a state, it is not required to collect sales tax for sales into that state."
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roll a joint
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MERCEDES-BENZ M950F HISTORY