$235??? How big was this thing? 10 meters wide?
I just got quoted $110 for an 800x600 6mm thick chemically hardened and grey ("smoked") piece, including 50mm rounded corners and polished top for a table-top. That was from a local glass place near me that does a whole bunch of window and desk top stuff en masse.
I think you need to shop around. Find your local warehouse/industrial district, and go for a drive to see what other places are there. Thats what I did, and ended up saving almost $500 on parts including metal work, glass, and laminate printing. Best of all, all of the places I'm dealing with are in the same street!
Non-specialty stores like Bunnings and co are always going to charge a markup if it's not their primary business.