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Munster Rugby Supporters Club have overseas branches. You can contact them to set up a Perth Branch. There are enough Irish expats in Perth so surprised there isn't a branch set up already.
http://www.mrsc.ie/branches/branch_news.php
http://www.mrsc.ie/contact/index.php
They also have associate memberships for this season open. It costs €30 for an adult to join.
Application forms are online here https://oss.ticketmaster.com/aps/mrs...g%5B0%5D=23042