The easiest and least expensive kennel sun shade that I know of is to take a simple chain link enclosure like the one pictured and cover half of it with a tarp.
More product information is available by clicking the photos farther on down the page.
Compare this photo with the one just below, which dog would be more comfortable in the rain, or the hot sun?
Grommets for tarps are sold most places tarps are sold and are very helpful in securing the tarp once it is cut to fit.
Kennels can be covered in many ways. Most of this site is about building shade, many of these ideas could be used as a kennel sun shade. Kennels could be covered with aluminum awning pans, shade sails or a steel paneled wood cover, just to mention a few ideas. This loafing shed idea could be used for a kennel also.
Amazon can provide shade for you pets without over charging.