I purchased quite a bit from Japanese resellers during Covid, and I would advise budgeting for customs and state tax. It seemed as though customs held a number of packages in order to assess charges. My recollection was 10% customs (first 800 USD wss free plus state sales tax). But, of course, please check to make sure.
I recall being charged approx 660usd customs on a 6600 purchase from Japan. But on another 4K purchase (from Japan) nothing. (The first was a bag ; the second was a Black box kelly longue wallet. Both fully declared values on the commercial invoice; and both sent via DHL.
In the grand scheme, better to budget for it. You can always be pleasantly surprised if it is not charged. I don’t know what the penalty is for the sender if the item is not declared properly, but Japanese resellers usually refuse to state anything but actual value.
Note re gifts: Gifts sent from business to business in excess of $800.00, sent via commercial courier or carrier will require an entry, payment of relevant duties, taxes and fees. Gifts worth up to $100 may be sent free of duty and tax, to friends and relatives in the US.