This answer is going to vary wildly based on your shopping habits. Because these recipes increase your family's fruit and vegetable intake, recipes could get expensive depending on what kinds you purchase and where you shop.
Generally, the recipes call for basic ingredients, with more “specialty ingredients” such as “hemp hearts” or “feta cheese” listed as optional. There are also reminders and suggestions for buying produce in season/on sale, using frozen/canned produce when practical, and nudges to use your leftovers to prevent food waste.
If you never bake anything right now, initially you will need to buy baking ingredients, which can be an additional upfront expense. They tend to last quite a while though (depending on how big your batches are).
Some meals call for convenience items such as frozen waffles or a jar of pasta sauce. These items may be cheaper or more expensive, and you are always welcome to make a convenience item from scratch if you’d like (but that may add more prep time).