Yes yes, Australian water is fine to drink. That doesn't change the fact that depending on what tap you're drinking it out of, the taste varies.
Haven't seen any of these advertised cheaply lately, so at $8.25 each, while not the cheapest they've ever been, it is pretty good.
However… I did also get a popup saying that if you signed up to their newsletter, you got 20% off your first order. Which brings it down to $79.80 at $6.65 each. Now that is a bargain! But unfortunately that is below their minimum $80 free shipping value, so you'll either have to buy something else, or just pony up the 99.
The limescale ones are at $109 for a 12 pack though. And they reckon that's saving $77 on those too, so that seems like a good thing if you take 20% off that ($87.20/$7.27 each before anyone asks). https://store.brita.com.au/filterscartidges/e00128-maxtra-pl…
Can be had for $81 with 5% off coupon. I'm not sure if the 10% tax would apply to this though. If it does, it may not be the best option
The cheapest item can find on Brita's site is [this] for $7.50. 20% off that total would bring it down to $85.2