(Washington) Do I need to pay sales or use tax when making my purchase from Washington state?

Sales or use tax is due on certain purchases delivered or sourced to Washington. Washington requires you to file a use tax return when sales tax is not paid at the time of purchase. This message is required under the Revised Code of Washington 82.13.020(2)(a)(i) [LINK: http://app.leg.wa.gov/RCW/default.aspx?cite=82.13.020].