What are some good snack ideas for a 3 year old and a 17 month old?

I have a very limited budget and was wondering what other people are giving their kids for snacks that are cheap. i have done the goldfish, dry cereal, yogurt. Fresh fruit and stuff like hummus is so expensive, which I hear all the time. I do buy the canned fruits, but I usually serve that with breakfast and lunch. So I want something different for snacks. I also want to be able to give the same thing to the 17 month old as I do to the 3 year old. Thanks