i was there the last time we played barca, we got tickets in the middle tier behind one of the goals directly from one the ticket office at the stadium.
they wouldn't sell them to you if you had an english or irish passport and there was a limit of 4 tickets per person. we met a lad from belfast who had an american passport and he was able to get us 4 tickets. there were €92. a friend of mine who lived in spain had a spanish social security card and they sold him a ticket even though he had a celtic jersey on so they weren't that strict. there was no problems getting in once you had a ticket.
the away fans section was way up on the third tier just around from us, it was one of the coldest matches i've been and we lost 1-0 but it was a great trip. went to a casino at about 4am the night of the match and i shook hands with Massimo Donati in there, i jumped out in front of him as he was leaving, he didn't hang around for a chat.
we were there for 5 days and rented an apartment which was 100 yards from a little irish pub called the shamrock that had rte (owned by a spanish fella who was sound).
it doesn't look much from the outside but the staff were sound, i went back there from a holiday in the south of france because i couldn't find any pubs anywhere near perpignan which were showing one of the irish international matches and they had the match on and loads of irish that were working locally were there.
heres a google map link for the pub:
and heres the apartment block from friendly rentals, its about 5 minutes walk to las ramblas. i think there was a minimum 3 night stay. its the gated door:
here is the ticket offices outside the stadium:
would love to be going back but i'm away on holidays. going to try to get to benfica match instead.