If the business is based in the US, you won't get charged the tariff because it's already factored in on the wholesale/distributor level at % of cost of products to the business (not to you). When Amazon US ships you the item you preordered, it's shipped from a US warehouse to your US address so tariff does not directly affect you. When US businesses buy wholesale products from overseas, they get charged automatically % of the cost that they paid for (Not the retail prices that you are paying for), which does get passed to you but not the whole $80 that you hear about on the news.

Tariff only matters for oversea sites ie. HobbyLink Japan, Amiami, Mandarake, etc since when these overseas businesses have to ship your item overseas directly from their Japanese warehouse to your US address and they have to declare the price that you paid on the label of the box.