You'd pay more in the import and shipping fees than you would in sales tax.

Usually, items below 800 USD in customs value are not subjected to further taxation

Unfortunately this is no longer the case in the US, the de minimis exemption was suspended last year:

As of August 29, 2025, everything changed. The U.S. government eliminated the de minimis threshold for all countries, making the rule apply regardless of country of origin. That means every shipment — regardless of value or origin — will now go through formal or informal customs entry and be assessed import duties, taxes, and fees.

federal duties will still apply, and that stuff has changed a lot in the last year. most of what used to come in 'free', is not any longer.

many states will expect a buyer bringing-in items to use in-state that were bought elsewhere, with lower or no sales tax at point-of-sale, to pay the equivalent of the sales tax, commonly called a 'use tax', if the items would be subject to sales tax if purchased locally. such use taxes are difficult to enforce, and are rarely reported or paid voluntarily by individuals.

also note that the cheaper switch2 version sold in japan is region locked to that market and language

I believe this is another LLM-bot account, due to similarities with the others. See this thread.