As I understand it, DIMM memory modules (HTS 8473.30.1140) from Taiwan are currently exempted from US import tariffs, but the carrier might still charge me a brokerage fee.
Two years ago, the price of the memory was such that it would have been covered under the US de minimis exemption, with no special handling or brokerage fee. Trump and Congress, in their wisdom, eliminated the de minimis exemption.