Hi Gary
I have spoken with my landscaper who has been here over 20 years and designs and maintains lots of gardens, both small and large, he tells me you can get the at the large Garden Centre in Pueto del Rosario but they are imported. Not only that, but apparently Coconut Palms are a bitch to grow and maintain here. He planted 5 on his organic farm and only 2 survived and then not very well.
Hope this helps and sorry it cannot be perfect news.
Steve