Tickets Question: Barcelona - RCD Mallorca

[leemeta]

I'm traveling to Barcelona and would like to see the FC Barcelona - RCD Mallorca match. Most of the good tickets are sold out. Is it best for me to buy the tickets now or to wait for some members to give the tickets back? When do they go on sale (returned members tickets)? I need 8 tickets for my family and friends and I'd like them to be in a good sector (and all in the same sector preferably).

Thanks in advance.