Well.. MAP will stop the advertising of those deals - I know with certain companies that have restrictions like that I commonly hear 'prices too low to advertise' - by going to the website and going through at least part of the process (adding to cart, etc) you can usually check the price before purchasing, and that may reflect a better deal. MAP technically (from everything I've seen/read) stop the sale of items below that price, it's literally just the advertisement.