Buyer beware: A new survey shows prices at Walgreens are all over the map.

Some everyday items vary as much as 55 percent between the chain's stores. Examples: Claritin tablets that cost anywhere from $10 to $16 in New York and coffee prices that range across $3 in Dallas.

Sally Greenberg with the National Consumers League says they want consumers to be aware of the price differences, and they want Walgreens to address the issue. 

Walgreens says the prices just reflect the everyday cost of doing business in different neighborhoods. The big lesson: do your own price checking and ask for a match.

"This could happen in a grocery store, this could happen in a mattress store," Greenberg said.

Prices varied at CVS and Rite Aid stores as well, but not nearly as much.

[ Read the study from the National Consumers League ]