Hi Andrew and welcome back to the forum

Yep we do try to go by the book as much as possable and we are also very happy with the raw material side of things and the back up we get from our direct supplier Agecrete in Bayswater
http://www.agecrete.com.au P.S They deliver to Geelong.
I guess i remember when i started eons ago prior to this business i looked more at the cost of materials rather than what they can offer me in the long run. I have also found that if you can stick by a supplier they will stick by you and whats $3-$5 per bag.
If you read this reply prior to Grand Final weekend i will be down your way this weekend (Wallington) give me a yell 0404289457
Cheers
David