The table below is a materials list containing links to Home Depot's web site. I don't have every receipt from the project so some of the items listed are from memory. I used the prices from the receipts that I do have. The other prices came from HD's web site.
|1||4x4x6 Pressure Treated timber||5.27||5.27|
|30||2x4x8 Dried Whitewood Stud||2.92||87.60|
|6||2x2x8 Spruce-Pine-Fir Furring Strip||1.53||9.18|
|1||Charcoal 3-Tab Shingles||22.00||22.00|
|1||Felt Roof Deck Protection||15.50||15.50|
|1||Galvanized Hardware Cloth||9.97||9.97|
I know there are things missing from this list. I didn't include nails, screws, hinges, hooks, and latches. As I mentioned above, and in my post about the nesting boxes, I used leftover OSB to build the nesting boxes. You'll need material for those as well. I didn't include paint because I used primer and paint that I already had.
I also seem to remember having a few 2x4's left over. I don't think I needed all 30 of them, but I don't remember how many I did need.
In any case, the above list should provide an idea of what it costs to build yourself a decent 4x8' chicken coop. I'd estimate that it's easily doable for $300-350 (in early 2013, who knows what prices will be in the future).