You might consider buying your machine from one of the suppliers mentioned to save significant money, and lean on this forum for manuals and guidance. Then buy your mask from local supplier.
The machines are easy to set up and keep tuned. The mass can be an ongoing challenge. After 3 years and many masks i am still searching for the latest greatest mask that will work for me.
It seems the perfect mask would be one that never touches your face but still maintains a perfect seal. I know that is impossible with current technology, but i can dream.
DeepBreathing, I live in Melbourne, I go to a franchised supplier here, their prices are higher but was happy to do it the first time around when I was a newbie.
Now that I know what I'm doing, I will buy over the net from the US next time I need a machine.
I still go there if I need a mask as I can try them on.