Kraco Boot Mat With Pop Up Cubes $5 @ Repco
These can be cut to size if too big. Just collected mine and the guy at the counter said that they were originally priced at $100, then recently reduced to $29.
Dimensions: Length 850mm X Width 1250mm
Did a quick search for Vic, following stores have stock at time of posting;
Checked a few postcodes in NSW and it allows you to purchase online and get it sent to your preferred store for click & collect.