Polyester outdoor curtains start at $29.99. They're great for non-permanent, seasonal use.
WeatherSmart and Sunbrella curtains provide the best value for your dollar. Panels start at $36.99 and $89.99, respectively.
Both Sunbrella and WeatherSmart curtains come with a 3-year warranty and are hand-sewn with care in the USA.
Unless you're a diehard fan of the Sunbrella brand, you'll find that WeatherSmart curtains provide everything you're looking for at a considerably better price per panel.