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There also used to be a few ticketmaster outlets around where you could go and ask for specific seats, and as outlets they could open up more seats for you. The newsagent next to David Jones in the CBD used to be one, but not anymore (sadly). The Ticketmaster website (http://www.ticketmaster.com.au/h/tcentres/wa.html) shows them, so you may be able to go along to one of these.