This is what I found on the codes that you are talking about....
WDW October - December room only discounts
Travel Dates: October 19 - December 23, 2008
some Sample nightly rates:.....
Polynesian, garden view room: $285 - $375
These prices are the nightly price, and do not include the 12.5% room tax. Weekday and Weekend nights appear to be the same price, though some nights during the travel dates appear to be slightly more expensive. Only the nights that fall within the travel dates above will be discounted, though your stay can extend past the end of the travel dates.
You must book this discount by October 18, 2008.
Make sure you ask for code NYB!
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DLK - Magic Your Way Package
UWI - Magic Your Way with Dining Package
KCF - Magic Your Way with Deluxe Dining Package