Hi Pamela!
If there are any deals during a period, Disney generally starts posting them as early as the quarter before the time frame (if not before). So, for example, you may see deals for the second quarter (April-June) as early as the first (January-March), and so on.
I should note: The month of July is a peak month for Disney, and finding deals during this period are slim. Not impossible, but slim.
If you have a AAA membership, you can also check with AAA Vacations and see if you can take advantage of any discounts they may offer.
Otherwise, keep a look out on Disney's Special Offers page, which you can access at any time by clicking here.
Good Luck!