I recently bought the Automatic Chicken Door Advanced from Fleming Outdoors. It is very similar to the Chicken Guard except it only has timer mode or my advanced has an option to close or open at sunset & sunrise plus on minus how many minutes you choose, based on your Lat/Long, so that it automatically adjusts year round & you don't have to change the times. The unit was $200 shipped. They do sell it with a door, but of course that is more. I already had a plexiglass vertical door. They also have a basic model that only has timer mode for $20 cheaper. The cookie sheet door is a great idea! Mine is made in Lancaster, PA & has been awesome so far for 4 weeks.