As a customer in the US, should I be expecting to get a bill for additional tariffs or duties?Updated 7 days ago

Generally, no. LTTStore.com will deal with the import process into the US and one of the reasons for splitting up the store fronts is so that we can build the cost of duties and tariffs into the product price.  As usual, state and local taxes will be calculated at checkout and charged on top of the displayed price.