A simple way round would to do your own servicing, may not look good if your selling it on but if its just an oil change, brake bleed or just some checks pick up a haynes and do it yourself. Im sure everyone has a techie friend who would help for beers
But eventually more complicated things would need servicing and for this I would find a local small garage that tend to charge less and tell you more
Anyhoo just my 2 pence