Frustrating trip to NAPA yesterday

I needed one more brass freeze plug for my small block. One of the major chain stores looked it up and found the part number for this single item. The listed price (on the computer) was twenty dollars and change. I asked the girl clerk if it was made of brass or made of gold? After arguing with her and the manager about how that price was way off base, they insisted that was what I would have to pay. Left angry and went down the street and purchased the same item for a couple of dollars. I don't know when I have ever won an argument when a computer is not on my side.