As a CA resident the only use tax that I have paid is on a car bought out of state. Some of my wife's online sales have been resulted in sales taxes but not all. Some items bought from dealers here on CPF such as Battery Station, Lighthound, and several others are not taxed. No use tax has been imposed on us by CA on out of state online sales, as we have been either levied a CA sales tax, or not taxed at all.
Bill