Retailers have used “bait and switch” deceptive advertising tactics for decades. The old trick was to advertise sales on their merchandise supposedly with sharp markdowns. But once you came into the store looking to buy merchandise at the advertised sale price, you would be told that the advertised sale items were all sold out. The store’s sales force would be trained, however, to try to switch you to buy some other merchandise which was supposedly “on sale” for a good price.
That was controlled by “consumer” regulation making such “bait and switch” advertising illegal. That regulation required the store to sell you the advertised merchandise at the advertised sale price once the store was able to restock the advertised merchandise.