What food do they feed your son at after school care? Do you feel that it might not be fitting his needs? Or are you needing to pack his own afternoon snack and thats why you were asking here, for ideas? Your Child's nutrition is an important subject I agree.
Going with fruit is usually a good idea, dry nutragrain in a small container, sultanas with either dried apricot or apple pieces chopped up, rice crackers, rice or corn cake slices.
Generally on EB using the working "anyone" is considered bad netetiquette (rude), you are better off going with just the word "bump" (it is the more acceptable word) and people will see that you haven't gotten any replies and will reply