I've found a few websites selling batteries for laptops with www.....au addresses, but no contact numbers - they seem pretty cheap,

e.g
http://www.global-batteries.com.au

I'm guessing these are cheapo 3rd party batteries - are they any good? They're around 60/70, but the real deal from apple is $200

Can you recommend any sites?

eBay maybe? I know a few of my friends have bought some from eBay before, apart from taking about 3 weeks to arrive, seems fine.

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MY02 Liberty B4