Youngster

You deserve to be put through having to find a part in the nineties.
Now, the reason you have to do your due diligence is that parts' prices, like medical procedures' prices, don't seem to have any specific list, msrp or anything such. They can come with any random amount of zeroes or start with any digit.
So you need to establish your baseline.
The lower radiator coolant hose for my BMW (original BMW) retails for around 90 bucks online, 78 at fcpeuro which is not always the least expensive but known to be fair, and 70 bucks at bmwparts-something online, which has abysmal reviews. I also called my local dealership, and they very, very bored, quoted me $278 with unknown delivery times.
Top strut mount for my SantaFe retails for $130 a pop at my usual Hyundai online store (which usually has decent prices), RockAuto had two of them in stock (original Hyundai) for $21 a pop. Lucky I guess.
Unless you're very much ok with what you're quoted right off the bat, you need to do a lot of homework to get the right price.
And the right price is not saving a buck or two, it's simply not paying orders of magnitude more.