I worked at a Napa store for 23 years
(8yrs full time 15yrs weekends... someone bought out the owner I worked for, we had differing ideas(read as: major pay cut..not worth waking early on Sat AM), so now i have weekends free)
I just re-did the brakes on my sequoia ... all the parts aside from the formed steel lines, were purchased from Amazon.com... saved a boat load of $$
Rotors (F+R), pads, hardware, bleeder repair, rubber brake hoses, emergency brake shoes and hardware.. i probably saved $300 from what my cost as an employee would have been. Looked at Autozone, RockAuto, Carquest, NapaOnline, etc.. nobody was even close...
Amazon has a pretty decent "part fit checker" but always a good idea, once you pick your part, to go to the manufacturer site, and look at thier catalog to make sure they claim it will fit.
Maybe list the Year, Make, Model, engine size, type of trans, and side of the car(referenced as L or R from sitting in the driver seat)... we can make a game of who found it for the cheapest