The Walking Dead for PS Vita is one of Play Asia's weekly specials for US$24.90. You can get free shipping for orders over US$25, so I paired mine with a US$0.90 item which saved a few more dollars. All up my order was US$25.80, which is roughly AU$28.85 at the time of posting.
This is a US version of the game, so as always it is region free and will play in your AU Vita, but you will not be able to buy any DLC with an AU PSN account. The Vita version of the game includes all 'season 1' episodes and 400 days.
If anyone is interested, the $0.90 item I used was this: http://www.play-asia.com/nana-disco-graphic-seal-paOS-13-49-…