If I could make a suggestion, check this out.http://www.creativeshelters.com/
It's not an easy up canopy. But, the advatage here is that it is heavier duty. And if the tarp tears you can replace it with a standard flat tarp. If one of the legs bends, you can replace it with the proper sized conduit from a home store. You might even be able to just purchase the welded fittings and then get the conduit and tarp locally and save some money.