GRAND RAPIDS, Mich. (WOOD) — The law enforcement arm of the U.S. Postal Service says you should be wary of websites offering to help you change your address because many will overcharge you.

“It’s something that’s been going on in various forms or fashions for quite a while now. There’s different websites that take on different names,” U.S. Postal Inspector Nick Williamson explained Monday.

The U.S. Postal Inspection Service and Better Business Bureau Serving Western Michigan are warning people about shady change of address websites. Several third-party sites, including fastaddresschange.com, offer to help customers change their address with the postal service and other companies for a fee.

Several users placed complaints saying they thought they were only paying $1 for the service, but were actually charged $39.95.

“I would say be aware of what you’re paying for. Only go to the official United States Postal website,” Williamson stressed.

On USPS.com, you’ll only pay $1.05 for identity verification for an official change of address order. Want it even cheaper? If you go to your local post office and grab a mover’s guide with a change of address card inside, it’s free.