I wish the mods would put your term for dealership in the bad word list, it drags the entire automotive industry down including Peach Parts as some will include PP in that sphere.

When getting my 97 SL320 up to spec, I bought a lot of parts at the dealer that were competitive with aftermarket. An example would be coolant hoses, I changed every last hose on the car not wanting an unannounced breakdown. All but one was in stock at the USA warehouse , one had to come from Germany and it arrived the next day with no freight charge!

Sure there are parts that may be a better value in the open market ( like spark plugs, belts, some gaskets ) , but sometimes it isn't worth the time battling over a few $.