I’m interested in purchasing a sail awning for my patio

Have a look at Islatold in Caleta, just down from the bus station.  I understand that they're not particularly cheap but are good quality.  Awnings sadly don't tend to last long here!

Ideal sell a range of 6/8 awnings reasonably priced.  Then find someone with a big drill to put it up. Good luck.  

I can recommend Persymar they do retractable awnings as well as many other options and well priced , they supply and fit.