Oral B Gum CareToothpaste - Various selection 1/2 price. Minimum order 3.
Cheaper with subscribe and save.
My personal favorite is the Oral-B Gum Care and Sensitivity Repair Toothpaste. Not available for S&S.
Little bit more at woolies and don't forget your local supermarket.
The Colgate Sensitive ProRelief is also in special at Amazon.au for $5 each.
https://www.amazon.com.au/s?k=Colgate+Sensitive+ProRelief