Instead, get a bus or taxi to the nearest local supermarket and you'll save a fortune. If you are in Gran Canaria self-catered or half-board and plan to make your own meals, it's definitely worth the extra effort.
For example, you can buy half a kilo of sliced cheese in a big local supermarket for €3.50 while in small resort supermarkets you get about four slices for the same money.
Ask at reception for your nearest Spar, Hiperdino or Mercadona. If you are staying in Playa del Inglés or Maspalomas, there's a Spar and an Hiperdino in San Fernando. In Puerto Rico, the nearest big local supermarkets are in Arguineguín while Puerto de Mogán has its own Spar close to the beach.