Businesses and shop workers across Suffolk have been warned to be on the lookout for counterfeit notes after a number were used in the county.
In Beccles last Tuesday two portions of chips were bought in 10 minutes with fake �20 notes.
A fake �20 was also given for goods at a shop in Wangford on Saturday.
Similar incidents have happened in Aldeburgh, Saxmundham, Walberswick, Eyke and Woodbridge.
Police are asking all businesses to be careful and to check �20 notes carefully. The counterfeit notes are said to be on paper that has a different weight and texture to normal.
Anyone with any information is asked to call 101 or Crimestoppers on 0800 555 111.
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