I know this is an old thread, but I thought this might be helpful for someone in the future. $100 for a flight is WAY TOO CHEAP. Granted a pup would be cheaper than a 50kg adult dog, but not by that much!
I just moved to Adelaide from the east coast of the U.S. It's costing me $8,000 US for my Rottie x come with me (not including the extra vaccines and blood work required from the vet prior to her flight). The $8k includes flight, vet checks, care during layovers, a roomy crate, the paperwork, and the required 1 month of quarantine in Melbourne (with her doing the other 5 months of quarantine with my mum in the U.S.). I think there are other quarantine centers, but that's the one closest to us.
Just an FYI in case anyone is considering bringing a dog over from the states.