I have just checked the opening houers for the supermercados in San Miguel de Salinas.
Dia% (butcher)
Mon-Thu. 9-14, 17-20:30, Fr. 9-14, 17-21, Sat. 9-14, 17 20:30 Sun. closed
Eurosalinas, (butcher)
Mo-Fr. 7-14, 16:30-20:30 Sat. 7:30-15 Sun.8-14
Amable, UDACO or whatewer they are called. (Fish and Cepsa gas)
Mo-Fr 6:30-13:30 17-20 Sat-Sun. closed
Post office
Mon-Fr. 8:30-14:30, Sat. 9:30-13 Sun Closed