Hi Katie!
There aren't any guarantees, but Disney has on occasion sent exclusive deals to us via email for resort or dining plan promotions. These were deals that weren't shown on their
Special Offers page, and was tied to the email in which we secured our last vacation (many times the email thanked us for our last visit, and encouraged a return visit with some type of special offer). There was no special method to get this, as it appeared to just be tied to the email your last reservation was secured through...
Something else you can try is to go to the
Disney Parks link, then register your email address at the bottom-right of the page, which puts you on the list for news and Disney special offers.
In addition, you always have the main
Special Offers page, as well as AAA Disney discounts if you happen to be a member.
Good Luck!