As stated they do not have a dining plan like WDW's. Just prepaid vouchers that do not save you money. There are a few travel agencies that sell discounted vouchers for character buffets that saves a bit.
Not sure if they still offer it but Costco.com has sold packages that include 1 character meal for all guests for about the same price as Disney sells the package without a meal.
Dining is not as large of a part of the Disney experience as it is at WDW. Not as many resorts and restaurants. Instead most spend more time in the parks since its minutes to walk between the parks, resorts and downtown Disney without having to take a bus, boat or monorail. I suppose thats why they don't have a similar dining plan.