PDA drag panel
There are a vast range and number of smaller shops in Playa del Ingles, that said there are larger supermarkets less than three minutes drive and the Islands largest Hypermarket is just over 20 minutes drive (accessible by bus).
For those wishing to sell goods the entry point would probably one of the market like areas or large terraces that exist in and around the bigger commercial centers such as the Yumbo Centrum.
If you prospectice clients speak a little English then once you have permission to use a space you could setup and sell quite quickly.
At the other end of the "market" if you are selling luxary or expensive goods and require premises then you are effectively creating a "business proper" and would need to look at the Companies section on the menu here.