There is a summer offer available right now June-August that offers 30% off on Deluxe resorts with a PIN code.
The 30% room discounts are offers from Disney just like the Free dining:
here is the current offer for the summer months:
For a limited time:
Save up to 30% on rooms at select Disney Resort hotels!
Plus, get a free Park Hopper Option when you upgrade to a package that includes 5-day (or longer) Magic Your Way tickets. With the Park Hopper Option, youll enjoy same-day access to all 4 Walt Disney World theme parks.
Offer valid for stays most nights June 1 to August 28, 2014. Book through June 26, 2014.
Normally it is 30% is for Deluxe, 20-25% on moderate and 15-20% on Value (some resort hotels are excluded)
The other offers available for the summer months is the RO discount and the Memory Maker discounts. They are all available on the Disney.com website. Just look for the present about 1/2 way down on the main page that says "Explore our special offers"