You can't beat a store that is happy to help install the part you just bought!
I am so grateful for the friendly employees here who recently helped (I held the flashlight) me change an air filter. Then he tightened the entire air hose thingy that was loose. They also installed a battery for me a few years ago and a headlight. They saved me 100s! Well, maybe 10s of dollars.
See if your local mega mart will do that!
Me thinks not.