My patio umbrella cover came a few days ago from Amazon and I wanted to give it a quick mention. It's nice! It zips, so it's easy to put on a take off and fits my umbrella (9 ft round) perfectly.
It's gone up in price a little to $9.98 (was $7). But still beats the $13 at Lowe’s and that one doesn't zip. If you are in the market for one, I think you'll be happy with this one.