It seems Amazon is giving one day free shipping on
all in stock prime supported products some items. Earlier it used to be 2 day free shipping.
Free One Day Prime Delivery will only apply to certain products that are in-stock at an Amazon Warehouse near your delivery address. It is not a universal guarantee by Amazon as it appears to apply on a per-item basis. It appears to only be available in NSW at the moment (no such option in VIC, SA, WA addresses) and we suspect it would only be metro areas. Please report the deal if you see otherwise.
Expedited - FREE with Prime (Including to Amazon Lockers & Counters) 1-2 Business Days
You will see a delivery estimate when you add your item(s) to the cart and checkout the product. See Example