We will be building our very first coop. We bought all the materials at various places. We did not want to pay too much for doors and windows and were able to find $10 doors at Habitat for Humanity. We could not find any cheap windows, so we were going to just cut holes for windows and put screening over the holes and a hinged shutter to close the window hole. While we were at Lowes, however, we saw some $19 basement windows with screens and we decided to use those instead. We are going to add predator proof screening as well. The glass comes off to allow for ventilation during the warmer months. Tomorrow the lumber gets delivered and the building begins! Here's a pic of the window from the Lowes website. I'm getting excited!!!!!