If shoppers aren't careful this holiday gift-giving season, they could get hit with unexpected charges on merchandise and festive favorites from overseas.

"Unfortunately, a lot of U.S. consumers are going to be in for a surprise, especially if they haven't ordered something online in a while," said Jason Miller, a professor of supply chain management at Michigan State University. "They may be finding out that Santa Claus is bringing a nice little bit of extra fees with him this year."

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