This is good information. I stocked up on NAPA filters during the most recent semi-annual sale. But it's nice to know that a decent discount can be had year round, just by asking.
I've found that most of the auto parts stores have their strengths and weaknesses, and not all stores of a certain chain are equal. Bad management, or good management, can make all the difference. I've moved around enough to know that a good relationship with the associates really helps, no matter which store I go to.
I've also found that if I want top quality parts, I almost always find what I'm looking for at NAPA. CarQuest is another decent source for quality parts. But my local CarQuest is set up more for the local farmer, so I don't go there often. If I'm looking for value, I will go to Autozone. Parts are typically less expensive than NAPA, but still decent. And, depending on the store, the associates have a fair product knowledge. About the only time I make it to O'Reilly is when I'm picking up something in particular that they stock. I don't depend on their associates to be of any help. Usually, I know more about what I am buying than they do. Pep Boys is the Walmart of auto parts stores. They seem to be more about cheap prices and selling a lot more fluff than other stores. I don't even bother going in to one any longer.