Selected Optifast range on sale at AMCAL at 30% off RRP. You can avoid shipping by spending more than $89 or by click-and-collecting from a store. You can also add a Free Gift if you spend more than $30 or more.
In general, the VLCD shakes from AMCAL through this deal seem to be cheaper than most places and similar pricing to Pharmacy Online, but Pharmacy Online has a higher requirement ($149+) for free shipping.
Don't forget Cashrewards.
Be careful of gallstones