I dropped my daughter & friend off at the Airport this morning, heading to the Barca v Seville match tomorrow night.
I got the tickets as a Xmas present in December from Viagogo the tout website but no problem, printed them off by email immediately.
Price varies because they have so many available but we got some middle tier for 80 euros each - HOWEVER, they added on a 25 euro booking fee and 8 euro tax so it all adds up.
I've since been told by a mate whose wife is Spanish and has a flat in Madrid that dead cheap prices can be obtained at the ground for Real games and he reckons it's just the same for Barcelona but obviously that's a bit speculative.