Found these at Canberra Centre Coles. Plenty of each of them

Cadbury dairy milk with CC's original 190g

Cadbury dairy milk with kettle's sea salt 190g

Possibly national wide, also spotted in Melb, southern cross for $1.

Coles in Kelmscott WA has them for $0.75 thanks zacsg1

Also available for $1 at Coles Southern Cross thanks Kluvabargain

Edit: personal review

These are actually pretty good and I will be heading back afterwork to get more.