In the same area as the Honey nut bars, look at all of the many types of cereal/granola bars for about $2.50 a box.

Stay away from those with chocolate chips/coatings for warm weather use since they can be a mess when they get hot.

Chewy granola bars or trail mix bars keep well for weeks. I have carried them in pockets or packs on many trips. They are not bad even when you sit on them. There are so many different types and they are not expensive. Available at any grocery store.