If you need a big canopy, you can't beat the prices on eCanopy. They have great multi-purpose canopies, like King Canopy, for the lowest prices I could find. And, with free shipping on orders over $100, you get rewarded for spending a lot of money. So if you need a tent, I'd tell you to buy from here.
And you don't have worry about not being able to get sidewalls or the door you want for your tent. Ecanopy has all of the key King Canopy accessories, including zippered door panels, weight bags and replacement tops. If you can think of it, you can buy from here.
The best part is all of the things I could do with my King Canopy. I bought one for a party that I was having outside and kept it to keep my riding mower and lawn equipment under. Now I don't have to worry about leaving my lawnmower exposed to the elements, my canopy is keeping it safe for me. It was worth every penny I spent!