Find out when tickets are being released from Ticketmaster, and then make sure you get on at that time. Identify what price you are going to pay beforehand, as you don't want to lose the time when you're there. I don't know what the demand will be for this one. If you can't find any, keep re-searching, but also have your card details at the ready for when you find some. Unfortunately the only cash alternative is from scalpers & it will be about $100 extra per ticket