Looks like this is an in-store promotion only as the product doesn't appear on the Chemist Warehouse website.
According to the tag they normally sell for $5.99 but normal price at other stores seems to be around $3. In any case, at $0.99 each they are now even cheaper than buying the bulk packs from Aldi.
For those interested, they are made in Germany.
They also have 25% off Avent and Pigeon/Double Heart brands.
Damn I used to live there…shouldn't have move back to Victoria :P