I was surprised to see stamps advertised as being available at Officeworks. When we applied for one of our newsagencies Australia Post refused. They said we were too close to one of their shops. I know of an Officeworks next to an Australia Post shop. I bet they have stamps. It is wrong for Australia Post to do a deal with Officeworks yet refuse an individual newsagent for being too close.
That said, I am not surprised as I expect the two businesses have ties elsewhere which were leveraged to make this deal happen.