Yeah, most states that have sales taxes have "use taxes" to cover this case and the case of a wholesale item (no tax) being used in house. It gets enforced primarily in retrospect and on big ticket items that the state does see, like a vehicle purchase.
Broken_Hippo|8 days ago
Very common for a private sale to put the price cheap, but not free - $200 charged sales tax on $200 and a free car was charged on the estimated value.