Tickets

Hello all, I will be flying over from England tomorrow to Auckland and am looking to buy a ticket for this saturday's game while I am visiting your lovely city. I have had an initial look and can see that the official website takes me to ticketmaster to buy a ticket, just making sure that this is all okay if I do it this way? I can see that you can become a member also if this is a better way to do it? Thanks in advance!