There is a Mercadona in San Eugenio shopping centre, just reopened after a total refurb, or I think the supermarket just around the corner from Sol Sun Beach opposite the Fanabe Costa Sur is a Mercadona.

Hi
yes there is a supermarket at San Eugino.

It is below the shops at San Eugino.
You get into it by walking up the road at the side of the Las Dalias then at the back of the shops turn left and there are the escalators.

It is a cheap supermarket.

We always visit it on our 1st day on arrival and fill up with food and very cheap wine. Then get a taxi back to apt.

The fish stall in here is to die for. The prawns are fantastic.

Take my word for it.

There is a supermarket at the Sun Beach, it is not bad, but you can get cheaper. It is also very close (hehehe!)

There are also two more up by the Del Duque apartments, a Spar and not sure what the other one is.

If you are not carrying too much these are easily walkable, or a taxi.

All those little supermarkets are way too expensive...
Mercadona (indeed in San Eugenio and opposite of Hotel Fanabe Costa Sur) and Alteza in the little shopping centre below Aparthotel El Duque are very cheap.

Hi

There is a large SPA supermarket in Fanabe up the walkway opposite
Harleys Bowling,we use it when we stay at the Royal Sunset Beach Club.

The building looks like a big canvas top.

Daveyboy

In Mercadona you can get Sangre de Toro wine for about 3.60 Euros. In the UK, you won't get much change from £6. I found it to be the cheapest supermarket generally.

We stayed at the Isla Bonita hotel and it's just up at the top of "the ramp" at the back of the hotel. Very handy indeed.