You can order one from Amazon for less than $100. If your controller is located in the garage, order an inside unit. Also, if you get the exact same model that you have, it is very easy to swap it out with a few screws, and wire connections.
I still have my original controller, but I disconnected the black and green wires, which disables the rain sensor and the solar sync function. In my opinion, these functions are worthless. I set the controller manually.
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