Some variaty of kosher products may be found as well at the supermarket of El Corte Ingles on Diagonal Ave 617. The supermarket is on the ground floor of the shopping center and the kosher department is on aisle 13. All kinds of products from Israel are available there (of course with european prices..)
To find El Corte Ingles you would have to take the Metro line 3 (L3) towards Zona Universitària, get off at Maria Cristina station located on Diagonal Ave.
MACCABI KOSHER RESTAURANT
IN THE HEART OF LAS RAMBLAS
C/Ramblas 79, Barcelona, 08002
List of kosher product available at any non-kosher store.