There's so many instances of this type of advertising. I have gotten into the habit of just completely disregarding anything except the price on the tag for clothing.

At least for electronics you can price comparison and check price histories, but they change the information on clothes so often it's impossible to buy the same pair of pants twice. If I don't think the current price is a good price, I just don't buy it. $40 pants on sale for $20 that are worth $10 to me are still only worth $10.