[justin66]

Both. Microcenter tends to sell Raspberry Pi hardware at MSRP, and occasionally on sale a couple bucks below MSRP.

Adafruit tends to be a bit more expensive. It's never bothered me since I like the company and its service, but I think pretty much anything you buy there ought to be purchased with the thought that you're prototyping and if you want to buy many parts for a final product, you'll eventually want to source parts somewhere else. (or, I assume, call Adafruit and try to negotiate a better price)

It's understandable enough why both companies are this way. Microcenter is a retail chain and can do things Adafruit cannot. (in truth, they are partners on some things, so it's more complicated than that - the point is that Microcenter is a much larger company)