Stores Carry Revlon Skinlights Why Are Some Stores More Expensive Than Others?

Why are some stores more expensive than others? - stores carry revlon skinlights

I wonder why certain stores are more expensive than others when the same products virtually the same types of products, in some cases the shops carry the same brand to sell. Why is this so?

Example: Wal-Mart: Revlon lipstick gloss is only $ 5, but somewhere like Walgreens, momentum, and $ 6.99. Products and CVS Pharmacy are similar, but more expensive than Walgreens.

not just make-up (in my experience), but everything from food to clothing.
what can be given as an answer to the question of a fact or your own conclusion / (reasonable) opinion, why it is so.
Thank you:)