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Just recently found that you can save a lot when booking Hertz cars from "Overseas" compare with if you are within Australia.
Tried it today and it's still the same!
Attached a screenshot with normal booking from Melbourne and another one with 'private' safari session from "Hong Kong" (and open hertz.com and not hertz.com.au).
Dates are the the same and you can see that for Yaris price is about 215.52 / 3 = 71.84 per day, for HK session the same car is 48.59 per day!
proof - http://s24.postimg.org/f8u3k6qtx/Hertz.jpg (!!please read update!!)
and if you use double upgrade from previous post, it can be even better!
Good luck!
UPDATE: If you select the first price in HK version, the price will be similar or even MORE than in Australian version because of the next unavoidable fees and additional costs, so please check it careful and do more research - it can work!