Free
DDP was a promotion Disney ran that expired on 6/25/06. Basically, they are enticing people to come to the parks during what is traditionally a slow season (after Labor Day holiday here in the US). You did not have to qualify for it, other then the fact you had to stay at a Disney Resort, and purchase Magic Your Way park tickets. I think the minimum nights required was 4, but don't quote me on that. Unfortunately, you have missed the cutoff for booking to get
free dining. Hotel rates during the same time (non-free DDP) are very good, so it may be just as beneficial to book a hotel and buy the dining plan outright.
Good Luck!
Bill