Coles is selling all sunscreen and tanning products at half price or better excluding aftersun, clearance and Every Day items this week.
I think the best value is this 500 mL pump pack from the Cancer Council. It's the cheapest it's been since December 2016 and only $2.60 per 100 mL.
Royalties received from the sale of Cancer Council sun protection products support our vital research, patient support services and community education programs.
If quantity is important, it'd be worth considering Le Tan's 1L 50+ at Chemist Warehouse for $16.99. That's $1.69 per 100mL.
The 10% off FRENZY code is still working too, if you're ordering other stuff from them as well.