This is what I can come up with...
As of last January, 'Ohana Breakfast:
Adults $20.99 (10+), Children 3-9 $11.99, Under 3 Free (I think this is before tax... since this is a year later, it may have gone up a little.)
As of last August, Tusker House Breakfast:
Adults $28.75 (10+), Children $15.97 (3-9) (includes tax NOT gratuity)
Also as of last August, 1900 Park Fare:
Adults $26.62 (10+), Children $14.90 (3-9) (includes tax NOT gratuity)
I think in general the character meals in parks are a little more expensive than the ones in the resorts... though Chef Mickey's may be an exception... it's a popular resort one.