It's correct name is:
"ResMed DC Converter For AirSense™ 10 and AirCurve™ 10 Machines"
If you could post the price here and the supplier # or if they are not on the list just post the price and where they are located. It would be nice to say the currency- CAD or USD.
I have found it for $84 USD at 2 suppliers, and $101 CAD at a Canadian supplier...