Found grids in NSW at Bunnings Tuggerah on the central coast.

[Bamysmum]

Finally! After a year and a half of searching I've found grids at Bunnings Tuggerah on the central coast (NSW). They're selling for just under $13 for 5 grids with connectors. My existing coroflute pen fits into the grids (I designed it so when I got grids I could expand) and work's begun on a second level

[pigsforlife]

I was in Bunnings in Cannington (WA) the other day and found some grids. They weren't stocking them for awhile, but I am glad they now are. I do think the price is a bit too expensive though - $13 for 5 grids is crazy!