The cost of a particular service also depends on the schedule, the model and the year.
The older shedule has a big service at 50,000km and a bigger one at 100,000km.
The newer schedule breaks the big service out to the 112,500 and the 125,000km.
I'm curious as to how a cambelt is only good for 100,000km for a 2004 model but can safely go 125,000km on a 2008????
There's also a tensioner and several idlers that may or may not need changing.

Some cars get platinum spark plugs that can be anything up to $32 each, others get copper plugs @ $4.50 each.
Automatic cars cost more than manuals on certain services too.
Cars with oiled re-usable air filters cost a little more than a throw away paper filter.