I shop LQS mostly, but sometimes they do not have what I wantthen I shop on-line. I am more concerned about cost of shipping than tax. I have lived in Oregon and know there is an agreement between states that Oregonians do not have to pay tax on goods in WA, but do on service, like machine service. No such agreemnt with CA.
States will get their taxes one way or another. No income tax in TX, but higher property tax and sales tax. OR has no sales tax but they get you on income and property.