In Adelaide, if I could consistently get a double shot flat white $3-3.50, I would be happy. Also, assuming it tastes good. However, $4 would be where most places start, with the exception of a few places. Some places charge $4.50-$5 for a large and that isn't even a double shot. A new drive through coffee place called Muzz Buzz charge about $6 for a large double shot. And what is worst, their coffee is really bad. I only tried it once. Very American(I know, as the person with me at the time said so, and she is American). I have no issue with that, just bad coffee. I have also noticed recently(with yesterday being the most recent experience) that a lot of baristas(if you can call half of these people that) don't wipe or rinse the group head before making another coffee. Surely this is coffee making 101. Anyway, back to the topic, some places in Adelaide do charge for a double shot, some don't. It seems like no rules apply here and even bad coffee shops do well. Go Figure.