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"Harry Potter and the Deathly Hallows: Parts 1 and 2 Ultimate Edition is a six-disc set that includes both movies on Blu-ray and DVD, plus over 7 hours of special features."
Amazon currency converter was used to get this price which is inclusive of P&H, so I assume it would be even cheaper if you switched it to $AU and pay by 24 degrees card.
I've previously bought this edition from Amazon US and it played perfectly well on my Australian Sony Blu-Ray player.
Cheapest it's ever been
http://camelcamelcamel.com/Harry-Potter-Deathly-Hallows-Ultiā¦
(Can't link the Amazon page, so I'll just retype my comment without it)
If this was 3D, then I would + this without a second thought. But since you can pick up all 8 movies for $15 more, then I don't believe this is worth the money.