Costco has a partnership with Sunsetter if you mean an awning over the top of your deck and their prices are great, quality is great....if you mean shade as in window shaded we LOVE Smith and Noble who are online and do custom draperies, shades, blinds, valances...have done them in whole house several times and you can measure (they tell you how to do it) or they will send someone to measure and you can install or they have a network of installers. GREAT customer service. Great prices.
Also, have sails, they can be moved and adjusted depending on the wind, light etc. Add additional as needed. I chose the 16' Triangle Shade Sail by Colour Tree on Wayfair. I would suggest getting three smaller sizes and combining them. The 16' is great but rather cumbersome for small intimate spaces.