Hmmm... this is tricky. Because of dd1's celiac disease there are only a few restaurants we can go to. And only one of those has a "children's menu" that has a gluten free option so in general we have to pay full price. We're in a HCOL region.
There is a small Chinese all-you-can-eat buffet that we have been eating at since I was about 12 (I'm 36 now lol). Over the years they've gotten to know us really well and they've been wonderful about keeping dd1 gluten free. Since it's a flat rate buffet with different prices based on age, we end up paying for two adults, two children, and our youngest is free. Total bill, with hot tea, is $29 dollars.
There is a Mexican restaurant that is part of a local chain (they have four restaurants I believe). If we order off the pre-set menu (two adult, three children) the total is $28. Drinks would add to the total but we nromally have water.
Both of those are fun family places, but they certainly don't use local or organic foods. For local, organic, or generally "high quality" food the price is significantly higher.
Not too far away is an amazing (and very Celiac friendly!) BBQ joint. Fabulous food, locally sourced, and prepared with some serious attitude. But at an hour and a half away it's a "once a year" type outing. Eating from the lunch menu the tab for 2 adults and three children is around $80-100 dollars (depending on what drinks are ordered, or what desserts are on the menu). Eating from the dinner menu is about $100-120. For that we'll get four half chicken platters (half chicken, three sides), a hungry man type platter (chicken, ribs, pulled pork and three sides), and then dessert is usually ice cream for the kiddos and key lime pie for the adults.
Closer to home there is a wonderful Cajun style restaurant that is our "fancy celebration but still kid friendly" spot. So again, maybe once a year. They don't offer a gluten free children's menu but do make sure that dd1's plate/portion "looks" a bit more kid friendly even though it's their standard adult plate. Foods are local, organic, and seasonal, with information provided on where everything came from, when it was harvested or butchered, and so on. Dinner for two adults and three kiddos is around $120 if everyone orders a simple platter with water and no dessert. But since this is our "celebration spot" we only go when we're celebrating so... we generally have a few drinks and desserts and even appetizers! So $180 is more likely.
All that said, we eat out less than once a month and go to a "fancy" restuarant maybe once a year. Before kids (and even before the celiac diagnosis) we did go out more frequently... maybe twice or even three times a month. The China Buffet was always a favorite, but also places like Applebees or Friendlys that are no longer an option for us.