Shops and vendors that turists might need

Here is a list with the websites of the companies that rent car.

http://www.atesa.es
http://www.athloncarlease.es
http://www.avis.es
http://www.bcnrentacar.com
http://www.budget.com
http://www.europcar.com
http://www.gocartours.es
http://www.hertz.com
http://www.ifasa.com
http://www.laserrentacar.com
http://www.over-rentacar.com
http://www.pepecar.com
http://www.solmar.es
http://www.totcar.es
http://www.vanguardrent.com

If you want to send a post card, then you need to buy postal stamps, you find them on the shops named "TABACS" - where they sell cigarettes

If you need to buy tools, electricity components like outlets, cables, etc, look for shops named "FERRETERIA"

That's all for now, I hope it helps