I get my poly tarps and clamps that fit around the small PVC pipes or cloths lines at Harbor Freight - $1 when they have them on sale several times a year. The Bleach at the dollar store places is not as strong as Clorox and I can use it without passing out or collapsing from the smell. Literally. But I can't use anything but Tide.
I will have to look for rolls of the 4 ply plastic at Big Lots, I usually buy a BIG roll at local hardware store and its lasts me 3 -5 years. I use it everywhere, garden, coops, temp plant covers, staple it to cardboard and use it for dropping trays (when I am out of feed bags for liners), reuse it over and over, until it literally rots from the sun.
Dollar type stores are closing down around here though, its getting hard to find buys. Pretty bad when the dollar type stores can't make it. Thrift stores, never know what you'll find, great places to look. That's where my $15 dog carrier came from and that was a great price around here, I use it when I move birds around or clean cages.
A lot of the wood we used is after Hurricane prep. Plywood from covering windows. Because of the humidity we have to replace them from time to time, keep them rotating. We have used it to build the shed, on parts of the Duck house, and used the last of it for the quail growout pen. I may have to actually buy some for projects now. DH always buys 2x4's when they are on sale (he knows me well, I always have projects for him) and cuts them to whatever size he needs 2x2 or 1x2, whatever. Watch for old furniture, desks, bookcases tossed out and free, take it apart and use the wood for other projects. Right now one of my quail breeder cages is resting on solid Walnut legs from a walnut table, to raise it (they were the perfect size). I got into trouble for that one. Well I 'll clean the wood and sand it down when he gets the cage put on a triple cage set up. He'll reuse that wood for a carving project or something else.
Where to get 1/2" PVC pipe cheap? He uses them to make stands for the breeder pens. I really like my triple breeder pens with the plywood pull out trays under each. Keep a liner on it, pull the liner out dump it and done or hose it down if need be. So easy for me, I like easy, I need easy.