The pergolas are available in several different sizes. Here is a list of the sizes and pergola kit prices.
Alan's Factory Outlet also have gazebo kits which are shipped nationwide. The gazebo kits can be built with or without a floor unlike the pergolas which only come without a floor. Gazebos will give you more shade and the roof is fully enclosed so you will have more protection from the rain.
A third economical option for protection from the rain which makes a great shelter is a carport. Alan's Factory Outlet has free delivery and free setup in 18 different states on the carports. One advantage with the carports is they can be made taller where the gazebo kits and pergola kits are only built in one height. Here is a list of the sizes and carport prices.