Thanks to the ever-excellent [Man in Seat 61](http://www.seat61.com/luggage-lockers-at-stations.htm#Left_luggage_offices_&_lockers_in_Spain), I've found out that [there are luggage lockers available at Barcelona's Sants main station](http://www.seat61.com/luggage-lockers-at-stations.htm#Left_luggage_offices_&_lockers_in_Spain):

> 
> Barcelona Sants has luggage lockers, open 05:30-23:00 daily. Small locker €3.60, large €5.20. There's an X-ray check of all bags entering locker area. 
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It has been a year or so since I last took the train from Sants, but I can't remember seeing any signs for luggage storage. I also recall it's a fairly large station.

Does anyone know exactly where in the station the luggage storage is, and/or if it is well sign-posted from inside the station?