Inexpensive alternative
I've used an inexpensive painter's drop cloth, available at any hardware store. Made of light, cream-colored sturdy cloth material, with the installation of a few grommets and some bungees, you're all set. Obviously this won't give you protection in the rain, but it makes an excellent sun shade. It will look great. For the 240, a 6x8 size works perfectly. Total cost < $10. You can upgrade to something more costly if you're not happy. Good luck. -Ed