you can save alot by just installing them all urself or by a mechanic friend for say half the price...
i know my mate got his cars 100000km service at honda and they charged him an stupidly high amount for just timing belt and plugs.
heres a honda site from the philippines i found that outlines basically what you need to do for your 200000km service. hope this helps.

http://www.hondaphil.com/preventive.php?model=civic