I am exploring whether PCB prototypes can be imported tariff-free under HTSUS 9817.85.01. However getting a tariff broker to figure out how to do this properly might also be expensive.
If I'm designing something that would need 100 units though, that's going to send a design cost from reasonable to out of reach rather quickly.
Another perverse incentive is that to get items sitting in a US warehouse (eg Amazon), the seller has to pay the high tariffs before they can even start selling them, while also hoping that tariffs aren't lowered before they can sell them all (and the expectation is that Trump is going to have to dial back this idiotic "plan" of his some time). Meanwhile the seller of a direct shipped item has a confirmed sale and cash-in-hand by the time the shipment gets to the border. So I expect the selection of US-stocked items is about to drop dramatically, and the poor economic conditions and abjectly poor leadership is going to leave many people not feeling too bad about (or even gleefully embracing) shopping direct.