Right, the coffee maker company in China has some options:
* Figures out how to make it even cheaper (unlikely)
* Figure out how to avoid the tariff legally: Maybe move the manufacture or assembly to Mexico for the US market.
* Claim the product is something else, just enough to avoid the tariff(i.e. claim it's a tea maker, not a coffee maker)
* Stop selling in the US since they won't get any sales
* etc.
Also the other issue: the first thing the American company does is ensure it sells coffee-makers for $149 and not a penny less.
In fact depending on your tarriff regime, this can incentivize a bunch industries to actually raise prices if the new import cost is higher then they would currently sell at.
The incentive to raise prices is pressured down by customers' desire to not spend more money than they have to. If businesses can get away with raising prices that means the price was too low to begin with, tariffs or no tariffs.
That's dependent on the market actually being efficient.
If a consumer walks into a store and sees coffeemakers by ten different brands, but seven are all actually owned by one giant manufacturer and the other three by some American almost-as-giant manufacturer, then a tariff on the former will drive up the price of seven of them and the American manufacturer will almost certainly raise the prices on the remaining three. Otherwise, it's just bad business.
Oops, in "actually owned by one giant manufacturer", I meant to say "actually owned by one giant Chinese manufacturer".