The government says requirements to register their drones will be simple enough that owners don't need to pay a "drone registration" firm to do it for them.
Some websites are advertising that they will register a drone for a $25 fee.
The Federal Aviation Administration plans to require that most owners register their drones so that they can be identified if they crash or are caught flying someplace they shouldn't be.
A government task force that includes drone and aviation industry representatives is expected to release plans later this week on how people can register their drones.
The FAA said in a statement on Monday that drone owners should "think twice" before using a registration firm since the process will be no more difficult than registering any other product.