Wait a sec dealers mark up some things way to high but not everything:
Online $341 for a vacuum pump for my SDL, dealer $339
Water pumps about the same price around $100.
Radiator online $395 dealer $571.
Filter prices are all reasonable.
Interior parts are cheaper then what my local Toyata dealer was charging me for crap plastic Camry parts.

You just have to shop around, some parts they are way over some they are about the same or maybe even cheaper.

__________________
2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200