ATM (Money Back Food Store)

The staff is friendly, but I have a problem with the way this store has items clearly marked with one price, yet at the register you find out it's more. This happened to me for the third time today. Monster energy drinks were listed at 2 for $3. So I got 2, took them to the register, where they were almost $4.50 instead. I pointed out that the sticker clearly stated 2 for $3, and was told that price only applied to the green and blue types, even though that price was listed in 3 separate spots, across the entire selection.
So I put them back, and took pictures of the prices. A woman (I assume a manager) came back to reiterate the specific types and pointed at the first label. When I pointed out the other labels, she just pulled them off.
I think the owner of this store believes he/she can lure you in with a sale price, and trick you into paying full price once you're at the register because you're in a hurry, too busy to argue, and it probably works most of the time.
I don't blame the employees - they're only doing what they're told. But as I said before, this is the third, and last, time I've had this bait 'n switch thing happen at this particular store.