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And managers whose stores’ stated policies impose time limits and proof-of-purchase requirements indicate that, in practice, they are often much more flexible.

Many of the remaining seats were sold by a department store for $5.75 each plus five cigarette proof-of-purchase coupons.”

A Sealtest skim milk offer gave consumers the chance to get a new bathroom scale with a proof-of-purchase tag.

Once you buy something, the app lets you post that news easily to your Twitter or Facebook feed, or e-mail it to others, and it stores a proof-of-purchase voucher page that you show to a cashier.

Atari, in a joint venture with Post Cereals, will even swap equipment for proof-of-purchase coupons clipped from breakfast-cereal boxes.