The Office of Fair Trading is urging residents to check prices at the till after finding misleading pricing.
Trading Standards inspected 31 food retailers across the Island and issued advisory enforcement notices to more than half.
It said issues such as shelf prices not matching till receipts, expired offers still being promoted and misleading labelling were found.
Office of Fair Trading Chairman Tim Glover MHK described the findings as "disappointing" and said the public should report any issues directly.
Sam Barks to present radio show
Hospital sees nearly 300,000 calls over past year
Police tackle school parking offender on first day back
Middle gets pre-election requisition meeting
Anyone can make parking discs - but only the DOI's are legal
Douglas hotel's football sign could be worth £15k
Douglas church becomes House of Dog
Manx mums relate to Paris's school holidays feelings
