[ame="http://en.wikipedia.org/wiki/Resale_price_maintenance"]Resale price maintenance - Wikipedia, the free encyclopedia[/ame]
They have an agreement where they can't advertise below a certain price on a lot of products.
And yes, you can email, call, or use the 'ask for better price' button on their site and get a better price on just about everything on their site. They will also often list 'open box' items for cheaper and most of the open box stuff is really new in box and they just say that so they can list a better price.