Chemist Warehouse currently have these Visine eye drops (15mL) bottles at a very cheap rate - although not advertised as discounted.
Quick Google search shows cheapest around at $8.95 (Chemist Direct/Pharmacy Online) and even dearer at Healthylife and Priceline.
Comes in three different formulations:
Visine Allergy Eye Drops 15mL - https://www.chemistwarehouse.com.au/buy/8323/visine-allergy-…
Visine Clear Eye Drops 15mL - https://www.chemistwarehouse.com.au/buy/8325/visine-clear-ey…
Visine Advanced Relief Eye Drops 15mL - https://www.chemistwarehouse.com.au/buy/8324/visine-advanced…
Good to stack with current Shopback upsized cashback via Westpac Lounge https://www.ozbargain.com.au/node/835752
Isn't it just Sodium Chloride??