I see your point, but lets talk Customer Service
You may be right as to the legal issues, but lets talk Customer Service. Nordstroms for one will always honor a sale price after a purchase at list. Do they have to? No, but it is the right thing to do by the customer. Besides, the way United used to do it encouraged people to buy without the fear of the price falling because they could get a voucher, which might never even be used.
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