Not sure whether Calendar Club usually has a better discount offer once we're into the New Year, but have just checked the website and there's a banner ad stating "40% off storewide - Limited Time Only". They offer free shipping for orders over $35 anyway, but this free shipping deal https://www.ozbargain.com.au/node/219443 applies to all orders. (have just tried a dummy order on the website and the free shipping code worked).
Note: Free shipping offer using code ends 10 January. Currently no end date listed on the webste for the 40% discount offer
Pleased to report the previous problem with the 40% off not working when items added to cart has now been fixed! Free shipping code is also still working