Not exactly a sale, but they do have a gift section under $20 and a chance to win a Christmas Pack:

The 2016 Christmas Collection - Shop Now!
Order from our gift guide in November for your chance to WIN the Ultimate Christmas Pack!*

*Terms and conditions apply.

Delivery cut-off dates:
01 December for Non Stocked Items
08 December for In Stock Items

Angus & Robertson Bookworld Gift Guide | Angus & Robertson Bookworld