NEW YORK — At Fleece & Harmony, a woolen mill and yarn shop in bucolic Belfast, Prince Edward Island, in Canada, owner Kim Doherty used to be able to send yarn skeins to U.S. customers across the border with little fanfare.

The yarn orders usually met an import tax exemption for packages valued at under $800, meaning it could be imported tariff-free and avoid the customs process.

But ever since the Trump administration eliminated the exemption as of Aug. 29, the cost to send yarn to U.S. customers has skyrocketed. The bill for a $21 ball of yarn now includes $12 to $15 in brokerage fees that her shipper UPS charges, plus state taxes and a 6.5% tariff, all of which almost doubles her costs.

“We had orders that have reached the customers and they’re in shock about the fact that they have

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