If you can wangle a seat in the middle of the South (Rio) stand, then you are killing it. Though it may cost your around €50 for the privilege (more if it's Barcelona or Real), they are unquestionably the best seats in the house. Going behind one of the goals will save you up to €25 a ticket, so it's hard to argue with that if you're on a tight budget. Matches don't tend to sell out fully (again, different rules apply when it's one of the titans), so you can usually leave it pretty late to buy your tickets.

Upper Tribuna and Lower Tribuna stands are the best seats in the stadium, but also the most expensive ones. Depending on the game, it's possible to buy tickets from 25 euro. For a match between Celta de Vigo and Real Madrid, you will not pay less than 70 euro (price for seats with the worst visibility).