Dave (TDG Farms) S.E. Washington State
here we have a locale tarp it place that tarps thousands of tons of hay around the area for the big hay farmers. For a fee of course, but they always have torn older tarps they sell for cheap but are still in usable condition. Might look into to see if there is a place around your area that does the same. Thats about the cheapest way I can think of.