I live on Oahu but just spent a couple weeks road tripping from
Legoland New York to Minneapolis. Some areas were a little more expensive than Honolulu (but not Aulani) while others were significantly cheaper. We were forced to eat at McDonald's a couple of times to keep the kids happy, and McDonald's in the Poconos and at rest stops cost about 10% more than in Hawaii.
We rented a cabin near Sugarcreek, OH and the prices at the Amish grocery stores and restaurants were about 30%-40% less than what we pay here. We spent a couple nights at Wilderness Lodge in Wisconsin and their food prices were in line with Aulani's, i.e. $7 for an ice cream.
Restaurant prices in Hawaii have SOARED in the past year while portions/quality have diminished - Chapek would be proud. Ulu Cafe prices have risen at about the same rate as other establishments on Oahu. A surf pack deluxe at Zippy's (aka where the local eats) is a little under $19 so I don't think a $26 entree at Ulu Cafe is out of line considering Aulani is 1) a resort and 2) owned by Disney.
Helpful hint to anyone picking up groceries on Oahu - Kapolei Target will price match their online price. For example, Juanitas tortilla chips used to be about $7 in store but only $2-$3 online.