You should see what happened to the folks on Dogpages last week .... Tescos mispriced their own brand dog food. Should have been something like £2.90 for 6 but they were scanning at 43p!!!
Soooooooo the folks of DP practically bought every tin they could find with the intention of giving them to rescues. Lots of people managed to get like 120 cans instore with no trouble. Some people ordered online ... The following day Tescos twigged what was going on and put the price back to normal. Those that got early morning deliveries had the cheap price but those that ordered for afternoon got charged full price as Tesco wouldn't honour the cheaper rate. They returned the food back with the drivers. A couple got on the phone to Tesco customer services and managed to get their orders at the cheap rate of 43p for 6 tins.
Just goes to show, a) don't trust the price that you see, b) get complaining