here is an amazon link as well if harbor freight does not ship to you! amazon cloths

I'm a gallery art painter who creates large works, and I simply use somewhat thick canvas dropcloths as painting canvas. I prime the hell out of it, and I've never had a problem from a single buyer (sold about 50+ paintings). It's cheap and it works -- and way better than many overpriced art canvases. For instance: https://www.amazon.com/dp/B00TIXP6EU/ref=cm_sw_r_cp_apa_fabt1_ViBTFbWCJ25X9