We found this quite interesting, how anyone would be able to pull this off.
Four charged over $1.5m Wal-Mart price switch scam
Two US couples have been arrested on suspicion of masterminding a price switching scam involving counterfeit bar codes estimated to have cost Wal-Mart stores across 19 US states a total of $1.5m over last decade.
Sisters Julie Marie Simmons (AKA Julie Poore), 35, and Laura Simmons Howerton, 39, and their husbands Michael Poore, 29, and Dewey Howerton, 39 were arrested in Nashville, Tennessee and charged with theft of $60,000 in connection with scam, AP reports. Investigators suspect two couples and up to 30 accomplices systematically plundered Wal-Mart and two other unnamed retail chains for years and stole much more than this.
The gang allegedly used a home PC to duplicate bar codes for cheap products which were placed over genuine bar codes of more expensive items. Merchandise bought "on cheap" was either returned for refunds, exchanged for vouchers or sold on at a profit. Police reckon ring escaped detection for years partly by visiting shops at their busiest times.