I know there is a thread very similar to this, however, it extremely old, and the links posted there are long dead. :( So, I thought I would share what I just found. I asked my math teacher how to acquire a city traffic signal, and he told me that (by some law) the city has to sell surplus material, if it is deemed usable. So.... as it turns out, Colorado Springs Utilities sells a pallet of surplus signal stuff around the summer months! So, if you live in a large city, just look up "[city] Surplus Sale/Auction" , and look through the old listings to see if there is a pattern. I'm going to try and email/call them to see if they are selling any this year. Your situation may differ, and the equipment obviously wont be the same, but I thought this would be helpful to some.