it is quite easy get a ticket (not for main games obviously).
best place is fc barcelona team web. there you can buy tickets and print at home. if you look for some seats together, it can be a bit difficult, but 2-3 days before the game you could find them cos then is where ticket season holders sell their ticket (10-15k tickets are sold per game, but most of them few days before the match).
price depends of the other team, so better look at fc barcelona web and there you can see it.
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