This is classic bait and switch and was designed to lure people onto their website in order for them to sell a more expensive computer. Im sure the computer on the flier was never available.
Of course they note that the advertisement says "Limited quantities", and they are all sold out. I called the same day I received the flier. They refused to offer an equivalent system for that price, instead offering a computer $100 more expensive.
There isnt much recourse for consumers against this type of tactic, so the best I can do let everybody know about Dell's trade practices.