Price shopping- WOW

I did some price shopping a couple of days ago. The results (below) were all over the place. The part I checked is a stock oil pump screen/pickup for a 1975 360 .
Auto Zone Melling #72-2 $16.00
Orielly " 21.00
Advance Auto " 23.00
Napa Sealed Power #2241166 33.00

Summit Melling #72-2 26.00 + $10.00
Rock Auto Sealed Pwr #2241166 17.00 + $ 6.14

As you can see, a huge spread. The item is not in stock in the Denver, CO area so shipping time for all will be about the same. I also am in no big rush to get it. Some will say that shipping from places like Summit and Jegs will be lower per item when you buy more. While this may be true to a point, the above is the cost to get one item in my hand. Very surprised at the spread for the same part in Denver!