I would find a retailer that carries the patio umbrellas to see if they had a cover for them. If not do a simple search and see what pops up for you. Overstock.com would probably have one.
http://www.kelmarkfurnishings.com/aluminum-patio-umbrellas/3022.html is a link to a very good, cheap, affordable patio umbrella. It is 10 Ft. Tall and fits most patio tables with a patio umbrella hole.
I happened to actually find a great selection of patio furniture at Costco.com. If you have a membership at the Costco in your area you could even try there as well.
Walmart or Target will both be good places to buy a patio patio umbrella. Lots of styles and colors. They have metal, wood, and wicker so they can pretty much cover your patio umbrella needs
If your looking for a free standing and durable patio umbrella you can find a huge selection at walmart that would be my first choice for you. Try the sunbrella brand they have a very good name and very durable.
There are many websites out there that offer great deals on outdoor patio furniture covers, but the best one is http://www.discountpatiofurniturecovers.com/PatioChairCovers.aspx. Here you will find good prices with a huge selection to fit your needs.
The patio umbrella you choose must be sturdy enough to withstand the wind, the rain The sturdiness and design of the umbrella shaft is a good indication of the must for any patio umbrella
Just because a patio umbrella is missing a part doesn't mean that is has to be thrown away, which is good news, since a good-quality patio umbrella can be expensive. It can also sometimes be difficult to find a new umbrella that matches an existing patio set. Many companies offer replacement parts for patio umbrellas, including replacement umbrella canopies and replacement umbrella frames; these parts are typically inexpensive and fairly easy to change.
I don't really want to come see umbrella covers, but I could recommend a few good companies that make good ones. A great site is www.epatioumbrellas.com has cheap umbrella covers
Lowes would be a great place to buy! They have a much larger selection and have good prices. home also has a few of these in stock. you can check the prices on line.
I do believe you can find a patio umbrella that doesn't attach to a table. A good place to start looking would be your local discount store like Walmart. Where you place a patio umbrella has more to do with the umbrella base or stand than it does the table. A table does help to stabilize the umbrella but it is not necessary. By getting a heavier umbrella stand or even a rolling umbrella stand you can place your outdoor umbrella any where you want to.
Yes, this would be a good option for you to extend the life of your patio umbrella. It will also protect it from some of the effects of harsher weather, as long as you remember to cover it when not in use.
Amazon.com would be a good place to start, as they will have a large selection of seasonal patio furniture products that you can peruse from your own home. The site will also give you some idea of the price, styles and size of the covers available.