Sometimes the cheap stuff is the best. My town has a store that has a "penny candy" section. Each individual piece of small candy there will cost a penny, so you tell the clerk what ones you want in whatever quantity for each of them and get a mixed bag of candy to enjoy on your way home or whatever (there's not much to do in the area so you'd probably just stop there on the way between school and home). It's probably pretty similar to the dagashi stuff in a general sense.