Congrats !
If you live near office industry, in the back they have used Pallets. You can get good wood from that, smaller pieces though. But Free ! Some places put their stuff on the free section of CL.
I actually just got a 4-6 rubbermaid shed that someone was tossing out ! WHAT a lucky...
Under my Avatar is the link to MY COOP. It is a Rubbermaid 7x7 storage shed. New it is about $550 but you might be able to find a used one or a used wooden shed.
They woon't look redneck.
If Craigs List is big around you , you can get all sorts of stuff for Free or very cheap if you look...