Are there any discounts on Disney World One-Day passes?
The short answer is no.
Disney World does not offer any discounts on a One-Day pass. The only possible option for receiving a discounted One-Day pass would be to wait until your arrival in the Orlando area and go through a timeshare tour and sales presentation.
BE WARNED: If you do decide to go through the tour and presentation, you will spend about twice as much time with the timeshare group as they estimate, i.e. if they say the tour and presentation will take two hours, expect it to take four. Additionally, the salespeople for timeshares are very high pressure salespeople that are very good at what they do. This is not a "dig" on timeshares or anything -- you can make up your own mind -- however, you should be prepared to stand up to some very high pressure sales, if you choose to go the timeshare tour route for your discounted tickets.
Rather than trying to get a discount on your tickets, it's much easier to find discounts on dining and lodging throughout the Orlando and Disney World area. Spend your vacation planning finding these discounts and avoid spending your valuable vacation time in a timeshare tour and sales presentation -- unless that's what you want to do during your vacation. 
If you need help finding any discounts on your Disney, Orlando, or cruise vacations, please contact our travel partner, DestinationsInFlorida.com.