Disney offers public discounts on rooms and some suites. These discounts do appear on the Disney booking site. However, even though you can book some suites online, if the room or suite is unavailable online when you check, you won't see the discounted price. MouseSavers is a site that posts all available discounts
HERE. Also, is you are a FL Resident, Annual Passholder, military or DVC member, you are also eligible for discounts throughout the year. There are blackout dates for some discounts and they aren't always available, but it's always worth checking for some sort of discount so you aren't paying rack rate. You can also call to ask if there are any applicable discounts that can be added to your current reservation. It is harder though to apply discounts to suites, but someone has posted here that they had applied a small discount to a Tower suite.