The only ballpark quote I've had from a local supplier here in Perth was high up on top of the Himalayas. That was was about a year ago, but I don't think they went down by 58% since.
Chris
You asked "Enviro Vision" for a quote, didn't you? We also found them very expensive. We went with "Perth Double Glazing". They use exactly the same profiles (Koemmerling) and the same glass (Pilkington, now Viridien), but are MUCH cheaper. They are also doing our doors.
Gina