(Checked: Telstra, Internode, iiNET, TPG, Optus.)
That said, they do tend to have bandwidth quotas in the order of 50-500 GB/month depending on the plan you have.
And it is dirty expensive here. I currently pay $89.95/month for 300 GB/month via ADSL2 (20/1 Mbit/s) including line rental.
It's not as expensive as you think-at least if we're comparing DSL vs DSL and ignoring FiOS/Cable.
Our download limits are pretty similar to the most of the limits "hidden" by the US ISP's, and our ISP's typically offer better free content and are FAR better in terms of customer service[1] and more lenient if you are the type to regularly hit your limit.
[1]: In part because they have to be due to consumer advocate bodies, and also because this will be the key differentiator (along with content) when the National Broadband Network gets deployed to the majority.
...but I am used to Swedish pricing levels. $45 for 100/10 Mbit/s with no quota.
I don't have any other Internet providers that service my house...