Originally Posted by luxury
If you click on the link that eutow kindly provided, and then click on book now, it takes you to an on-line booking form. There it lists the various fees:
Chaperone service: 1 pax $500 3 pax $1050
2 pax $800 4 pax $1300 etc
Shuttle service to: $50 per seat, or $150 charter shuttle
Immigration
Porter service: $15 per regular bag, $30 per oversize/weight
etc etc etc all prices in HKG$
Alternatively, you can contact your hotel and they can arrange this for you in addition to the car service. They probably already have an account with this ground services company at the airport.