Generator 6" ST lace up safety boots shipped for $129 at WorkwearHub
The first decently priced pair of work boots that I found was for the Generator 6" ST lace-ups at $129 including delivery. I found the same pair going on Justworkboots.com.au (with free shipping for $165) and B-protected.com.au (shipped for $229).
Also good value are the Mongrel 290080 Black Hiker Shoe going for $69.95. The same pair will cost you $132.70 from Workin-gear.com.au and $170 including delivery at Comfortproducts.com.au.