Ouch! Volvo Parts Webstore doesn't have them, and it's practically a new car (by Volvo standards).
Skandix doesn't even recognise the part number.
GCP does, but doesn't have them either.
This list is from Volvo Parts Webstore in the US, with an indication of what else they were used in -
You may be able to get a used one from Berry's in Melbourne, but the unit will probably need to be re-coded with your car's VIN before it will work, because CANbus. The big hassle is to find someone to re-code a used one. About 7 years ago, Rontons in Adelaide managed to find somebody to re-code a used climate module for our 2010 S80 V8 - yeah, different module, but AFAIK all of the 57 damned modules in these things have this type of one-car-only CANbus coding.
Sorry to be the bringer of bad news, but CANbus is the work of the devil.