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, $30 per oversize/weight
etc etc etc all prices in HKG$