CELEBRATE
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Booktopia is offering free shipping with a min spend of $17.
You can also get free shipping if you click through via Booko, but this helps to save you a step.
Cashrewards is offering 6% cashback or up to 6.75% from Pricepal.
This is pretty good but also as a heads up bookdepository.com does free shipping always and generally has cheaper prices :)