That's another good point to consider - I built my place, lots of scrap plywood and chipboard pieces etc so all the cover I do is pretty much with scrounge materials. Over a few years I probably trashed a few cheap tarps, but almost no cost overall.And I have plenty of scrap metal roofing.
I would love to have a nice woodshed, like some of the beautiful work some of you folks have shown here - would like to take it on as a project - something I'd enjoy building and would put to good use - but time and $$ are not on my side these days. Scraps and a few minutes of my time does the trick and gets me by.