Y is the milk price cheaper in CVS store than grocery stores?

Question

For example, CVS/Walgreens or any gas station would charge 3.89$ for one gallon of milk but Walmart supermarket or HEB supermarket would charge $5.49.

Answer 1

because CvS is cheaper

Answer 2

walmart milk is $4.32 but i think it is cause not that many people  shop at cvs than walmart

Answer 3

Wow, your walmart and HEB are way overpriced.  At both stores in my area, the price is between $3.50 and $4.00.  CVS and Walgreens are always more expensive.