Be more specific on what service you want to carry out
Major to some people like myself is coolant flush,oil flush,change plugs,clean air pods,change petrol filter,change oil filter,check brakes,rotate tyres,check pads,diff oil change,gear box oil change
check battery level..,etc.etc.etc.....As you can see the list is large.
Each part that needs to be replaced has had some discussion on what type is recomended and
where they purchased the products from.
When you are happy with the products you want to buy,for the service....then shop them around to see the price differences.
Do a search on each service you would like to under-take.
Hope I have been of some help.
Cheers