Try the attonery general's web page as they now list all the countries there.

It will cost you at least 15grand paid over a period of the entire adoption, many will be more some closer to $25,000 and others over $35,000

My B/F is adopting from China - she is about 3 years into about an 8 year wait.
(We don't talk about it a lot - she likes to talk about other stuff)

She says even the 'good' adoption states like SA and NSW it will take most likely about 3 years due to the fact that Australia only has limited programs and there is such a high number of people being processed.