Exclusive: Chinese suppliers are offering U.S. Amazon sellers a tariff solution—but it’s not legal

President Trump's China tariffs are not just roiling the operations of Amazon sellers and other U.S. retailers big and small. They're also upending the businesses of Chinese manufacturers and distributors supplying goods to the U.S. from the other side of the world.

Now, some of these suppliers are trying to keep their businesses humming by offering a simple—but illegal—solution to U.S. Amazon sellers: lying about the value of the Amazon merchandise you are importing to the U.S. in an...