We began in May with materials we had or had found in the free section of Craigslist. We do have a local place in Missoula called Home Resource - people take materials from deconstruction, etc. and you can get great deals - and we did get a few things there. I think we bought some 2x4s and the roof vents there, we got plywood from somebody doing deconstruction and the rest was free. I would say we spent less than $200 on all the materials, including the chicken wire for the run.