Off the top of my head, Cafe Mickey in the Village (as you can choose just one course to eat there, and the characters are around all the tables at lunchtime and all evening after 6pm), or the Plaza Gardens tea party (this isn't a full meal, but a selection of pastries, desserts, some savoury snacks, hot and cold drinks etc, and again, the characters come round each table individually)
The Lucky Nugget and Inventions are full buffets, so you would have to pay the full price, regardless of what you eat there.