Customers can buy ADT signs at the official ADT Security website. They can also be purchased from websites such as Amazon and eBay.
When visiting the ADT website, users can fill out a contact form in order to have a customer service representative contact them. From that point, they can order the signs they wish to display. When purchasing an ADT system, customers often receive the signs for free as part of the package. The signs are used to let others know the home is protected.
The price of the signs and the selection varies greatly depending on the retailer. The sizes also differ.