It doesn't matter if you buy a candy bar or a car in California; if you take delivery anywhere in the state (except Indian reservations) you must pay sales tax on your purchase.
Not in Washington State...However sales tax laws very by state.
California
The California State Board of Equalization collects California state sales and taxes that provide revenue for state government and essential funding for countries and cities.
Taxes are paid in California at the time you register the car with the Department Of Motor Vehicles. You do not pay tax to the person you are buying from.
You pay sales tax in the county in which you live. For example, if you live in Cobb County, GA you will pay 6% sales tax on the purchase price.
You pay sales tax to the State in which the vehicle will be registered.
The state sales and use tax rate is 6.5%, 7% for Texarkana residents, of the taxable price of motor vehicles, trailers and semi-trailers with a gross purchase price of $4,000.00 or greater.
7.25 to 9.75% depending on state and local sales tax.
You can find information about California sales tax in the website of California State Board of Equalization. You can find information on the dates they last checked.
California has the most motor vehicles registered
Many taxes are deducted from your paycheck, but sales tax is not one of them. Sales taxes are collected by a merchant at the point of purchase of most goods and some services. The merchant remits the sales taxes to the state on your behalf. Occasionally, you many not pay sales taxes at the time of purchase, as in when you make a purchase online from a merchant in another state. In those cases, you would owe a use tax to your state which is usually paid when filling out your annual state income tax return.