EBay and traffic light contractors are good places to find used traffic lights for sale. Contact your city administration or neighboring cities to locate traffic light contractors.
You can purchase traffic lights that are no longer in service and refurbish them to meet your needs. Clean the traffic light, and then consult an electronics part store for advice on what parts you need to restore functionality. Paint the traffic light with high-gloss spray paint or auto body paint after removing its colored lenses and reflector pans. Old traffic lights for sale on eBay typically are more expensive because the sellers often have repainted and rewired them already for home use.