At the parts store in my town, there is two people that work there. A woman and a man.
The man, no one in the world likes to deal with, the woman, my parents long time friend, has worked there since my dad owned it back in 96. She knows almost everything, and if you tell her a part number she will get you that exact part unless from their many suppliers they cant.
Most of the time, if shes busy or doesnt know the random hard parts im usually looking for, i am able to go behind the desk and search it for myself. Thats why i go there instead of Partsource, Canadian tire, or Napa. Its much simpler to look for the part myself with people i know instead of some random kid who thinks he knows more than a mechanic.
One time i was looking for a cam for my 94 Chevy 350. Was near part source so i went there just for a shoot. The guy asked me what kind of motor after i just told him it was a 350 TBI out of a 94 chevy silverado. Duh! "A mild performance cam for a chevy 350" So he looks up a cam for it. Tells me about a stock cam. No, not a stock cam. Tells me it was $400 for a stock cam for it. That is not right. Could you show me the cam you are looking at? Nope. Ok then, you just lost all of my business. There is absolutely no point in being a super mechanic, thinkin you know more than a young kid. As i was 16 at the time. I knew what kind of cam i was looking for, i knew what it would be roughly priced, but the guy probably thought i was just there screwing his time. Shoulda asked if it was a flat tappet or roller tappet and seen what he said