I hadn't thought of fig bars! That's a great one - they are usually available in every little town, and he likes them.
I'm fairly happy with what I've been doing - he has only lost a little weight in nearly two months of pedaling his own bike. We've pedaled nearly 2000 miles - that's a lot for a little, tiny 10-year-old!! I feel like if I could just add a little something while he's actually on his bike, we would be good. Nuts and fig bars - sounds like a plan!