Hi again,
Ford have a "service calculator" that you can use if you go here:
https://www.ford.com.au/owners/service/calculator/
It looks like about $1015 roughly for the standard service at 160,000km and the replacement of the timing belt and the accessories drive belt (serpentine belt) so since the standard service is $430 the belts will be somewhere in the region of $600.
However since you have not said what model vehicle and year the car is there could be some variation because the calculator makes the assumption that the car is an MD model.
This said, if the car is less than 10 years old and has not yet reached the 160,000km distance there isn't any need for the belts to be serviced, unless there is evidence of premature wear. Having watched the video, I'd be happy to attempt the change myself, but I still have 120,000km to travel and I'm likely to be swaping the car before that happens.
A timing belt kit can be picked up off eBay for around the $200 mark. The serpentine belt is a less than $30 item.
Cheers