A chain supermarket I frequent here in Nan province regularly sells out-of-date products. In particular I frequently see out-of-date yogurt packs and have noticed (too often to be chance) that where there is a lot of them they discount all of these yogurt packs at the register. So being slightly savvy I always grab a couple extra of in-date packs when I see a lot of o-o-d and more often than not get a >33% discount on them.

To balance the story a little the wife and I eat this yogurt at home up to ten days past expiry where not enough homestay guests had the English style breakfast. We never serve o-o-d anything to our guests.