OpenCor is a chain of small convenience supermarkets that are open everyday (365 days a year) from 8 am to 2 am.

This shopping chain is the most expensive in Spain. Only use it if you have to, Best wait until the normal shopping days of Monday to Saturday. Shops do not normally open on Sunday by law.

Here is their website to find the locations in Catalunya:

http://www.opencor.es/opencor/cargarA...