We are working on this coop now. We are about $280 in so far, but have found a lot of free materials (floor, door, windows, some wood). We've only bought 16 2x4's and 6 sheets of siding. We did purchase a higher quality than the T1-11 siding, but it was only $12 more/sheet for pre-primed. Still have to purchase 1x4's, 1x3's and paint. $500+ easily in this if you weren't able to source some things for free/cheap.