You might consider looking around some more. Trailmanors that don't need immediate repairs are available for around that price. Also take a good look at the curtains, if the seals are worn those are probably wearing out as well.
For a do-it-yourselfer, the 24 mil white vinyl tarp which is sold on eBay, along with foam scraps from your local foam padding store, might be an affordable material. Definitely do not buy polyethylene tarp and be conscious of the thickness. It needs heavy duty sewing and seam sealing. Solvent welding of vinyl with acetone works pretty well but be careful not to dissolve the foam. It is also possible to thermally weld vinyl with a hot air gun and a roller, which also presents hazards to the foam. There are videos of how to do this on YouTube, but most of them use a specialized heat gun not available in the US. I suppose with some scraps and time you could establish the proper temperature and procedure.
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