Local shops
The nearest small supermarket and panaderia is leons on the front . open all year around. Small but you can get most things . 10 mins walk from apartment on front.
There is a futher panaderia in Isla Plana. 5 mins in car.
There is a pharmacy and a wine shop on the parade as you enter La Azohia.

Supermarkets
There are couple  of  bigger supermarkets in Puerto Mazarron , including Mercadona.
There is also a daily market by the bus station in Puerto Mazarron.

Hypermarkets
Eroski is on the La Azohia side of Cartagena around 25mins away.
On the other side of Cartagena on the way out to Murcia and Alicante there is a Carrefour and then a shopping park (parque del meditteraneo) a little further out. 

Other
There are banks and other small shops in Puerto Mazarron. For a wider range of shops it is necessary to go to Cartagena.