Are you kidding...that's in great shape. As everyone else has said check craigs list. They have a section called materials, as in building materials. Also put whatever you need into the search button because sometimes things will be under household. You can almost always get shingles. Also doors and windows. Get all that stuff before you start cutting so you can take any size door or window etc. We made a big mistake with our coop windows. Get a solid panel glass window that you can prop open for ventilation, prop open from the outside put harware cloth over the opening on the inside. We have slider windows and the rain pours in, as does the wind. It will be expensive now to take those out and replace. I just got some vintage windows with the wavy glass, all sizes for 5$ each off craigs list. I got them for the glass only. Now I have to find windows to fit the holes we already have and it is much harder. I think your coop will be awesome.