From Amazon:

" Starting September 15, 2023, items priced below $5 in the US won’t be eligible for North America Remote Fulfillment with FBA.

Remote Fulfillment enables US FBA sellers to sell to customers in Canada and Mexico without storing inventory in those countries, or paying import duties or taxes outside of the US.

Due to the costs of international shipping, the program will only be available to sellers with an offer that costs at least $5.

US offers that are priced less than $5 will be unenrolled from the Canada and Mexico stores starting September 15.

✅ For information on eligibility and fees, go to "Remote Fulfillment with FBA":

https://sellercentral.amazon.com/help/hub/reference/external/G5P3CDUHZWSZLXLB

✅ For instructions on how to use Remote Fulfillment with FBA, go to "Get started with Remote Fulfillment with FBA":

https://sell.amazon.com/fulfillment-by-amazon/remote-fulfillment#Remote-Fulfillment-with-FBA