I've had good luck with the Budget Bytes website. It's not all, like super kid-oriented, but mine have been willing to try most things.
Remember that it's as much about your kids' attitudes as their tastes! If I am serving something iffy, I offer them something they really like to get them to the table, and then if they don't eat their dinner... whatever. Tonight, for instance, was black bean burgers. Well, Little Brother (age 2) was having none of it, and Big Brother also looked skeptical. I offered them each one slice of American cheese (from Costco, naturally). Once Big Brother got going, he ate his whole half-sandwich. Little Brother only tried a few bites, but he had the cheese (and some pre-dinner broccoli and hummus), so it's not like he's gonna starve.
I do usually serve something for LUNCH that they really like--homemade pizza, Costco chicken nuggets, grilled cheese sandwiches, (all with either frozen peas or broccoli and hummus, plus usually a fruit) etc. They tend to fill up on lunch and breakfast, the meals they can count on :-).
FWIW my kids are healthy weights and our grocery bill is about $600 a month. Trying to push it to 5. They eat a lot of yogurt and hummus, both of which I have learned to make.