Here is a link for the air jack we are talking about.
http://www.arouse.com.au/ssl/category.asp
They are called Bull Bag Air Jacks down under.
I had one for years and can tell you I never had a single problem with it ever. Some folks did have issues caused by placing it too close to the exhaust system and melting the bag.
I believe the new bags employs some type of wire mesh heat shield that helps but does not completely eliminate this exposure.
Bob, it looks like you paid in US $'s.
Here they have them for A$245.
I believe the current exchange rate is about US$0.72 = 1 A$. (Not as good as it was two years ago ay 50 cents to a dollar. Pout!)
I'm going to investigate availability and pricing here if I can. When I know more I will post some info if anyone else has an interest.
Frank