gatorcpa
··ΩF InvestiGator...there should always be a sales tax added on top of the listed price, the rate being variable depending on which state they are in.
However, the New York buyer is subject to use tax upon his return to New York. If he paid sales tax in California on his face-to-face purchase, New York will allow a credit for tax already paid and he would only pay the difference, if any.
If the item was mailed, then full use tax is due in New York upon receipt by buyer, but as stated previously, that law is hard to enforce against non-registered individuals.
Which includes most of us.
gatorcpa