The key word is "suggested." Because dealerships are independent businesses, they are free to sell vehicles for less — or more, in the case of popular models — than the manufacturer's suggested retail price.
Some early Chrysler PT Cruisers sold for as much as $10,000 over sticker, as incomprehensible as that might seem today.
Automakers generally dislike when dealers mark up a high-demand vehicle, though there's often little they can do to stop it. Occasionally, dealers can be cajoled into backing down, though.