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··ΩF InvestiGatorFirms are supposed to now collect sales tax based on where the telephone or online sale is being sent. Example: a dealer in CA who sells to a buyer in TX is supposed to collect the applicable sales tax for the TX address and remit that tax to TX. (US Supreme Court decision in 2018; South Dakota vs Wayfair). Some companies don't comply or are dragging their feet as long as possible, but eventually most will have to comply as states aren't going to allow sales taxes to go unpaid, they need the money!
When you are dealing with smaller stores, they are likely under the limitation. Some states have agreements with other neighboring states to collect. If you are buying from a place in a larger city that is on a border with other states (like Philadelphia or New York City), they are likely over the threshold in NJ or CT.
The whole system sucks, but it is what it is.
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