Carmelita's has been in Salina for nine years. The story sells a variety of items from food to money orders.
Police say that on Tuesday, a woman came into the store and bought a money order with seven counterfeit ten dollar bills, two counterfeit twenties and one real twenty dollar bill.
"When she handed me the money you could see these bills looked different," Carmelita's employee Carmen Rosas said. "They were oily. The texture was different."
Rosas said the woman was a regular customer so she let her leave with the money order, but upon further inspection she decided to turn the money over to the police.
"Even five dollars with this economy is a big loss," Rosas said. "Besides being robbed your being robbed by people who know you. It's worse."
Officials say technology has made counterfeiting easier.
"With that people have changed the way they make money," Lt. Scott Siemens with the Salina Police Department said. " They will take a five dollar bill and wash it to make a twenty dollar bill."
Police say there are ways to tell if your money is real. Bills of twenty or above should have a security strip and if you hold a bill to the light you should see a faint watermark of the president's face.
After her experience Rosas has her own advice to give. "Be aware and go with your instincts," Rosas said.