Heating/Airconditioning/Heated Seats/Defroster Not working

It's called the CCM, Climate Control Module. I don't know the average price, sorry. You'll need to have it replaced and the software installed to make it work though.

You can get used CCMs for $50-$200 on eBay and at various junk yards. Do you have the wherewithal to change it yourself? You will have to get someone who can download software to adapt the new/different CCM but that isn't as big an issue as it would be if it was one of the many parts that require software and the engine won't run until it has been adapted/downloaded.