If I order a PiStop, PiStop - Traffic Light Add-on for Raspberry Pi - Pimoroni
how many units do I get? The pictures show 1, 2 or 3 units. You should put in the description how many units you get.
I would say you get 1, based on the price.
If you want to confirm that, the following link will let you e-mail tech support.
Contact Us for Raspberry Pi Technical Support - Pimoroni