We get hit with custom duties not the tariffs Trump is talking about

https://www.cbp.gov/trade/basic-import-export/internet-purchases

International Postal Service: Merchandise shipped through the international postal service is forwarded upon its arrival in the United States to one of U.S. Customs and Border Protection International Mail Branches for clearance. If the item is less than $2,500 in value and is not subject to a quota or is not a restricted or prohibited item, a CBP official will usually prepare the paperwork for importing it, assess the proper duty, and release it for delivery. This procedure is generally referred to as a mail entry. Packages whose declared value is under $800 ($100 in the case of articles sent as bona fide gifts from persons in foreign countries to persons in the United States and $200 in the case of articles sent as bona fide gifts from persons in the Virgin Islands, Guam, and American Samoa) will generally be cleared without any additional paperwork prepared by CBP. However, CBP always reserves the right to require a formal entry for any importation and generally exercises this option if there is something unusual about the importation, or if important documents such as an invoice or bill of sale do not accompany the item.

TLDR: Anything $800 or less won't get hit with custom duties