house construction sites, co-workers, a local used building material reseller, etc. i am almost done with a 4x8 coop on stilts with a 3' wall in the back and a 4' wall in the front. everything but the siding was donated to me. lumber, plywood, and OSB came from co-workers' old projects. more lumber came from 4 big pallets that my employer was about to give to someone to burn for firewood. tar paper and shingles came from a co-worker whose house was re-roofed this past summer, and the old leftover shingles didn't matcher her new roof. windows were given to me by a friend. insulation was robbed from a couple of houses under construction down the street from us. after searching hi and low for free or recycled siding, i broke down and bought some new T1-11 siding at a local lumber yard.
long story short - look around. we'll have about $74 in our coop, and that is exactly what the siding cost us yesterday. i know if i can do it you can.