Instead of buying the expensive pre-packaged diet snacks, I buy a large bag of good diet snacks and I measure the serving myself ahead of time and I put them in ziplock baggies. That way, I can just get them out and eat them or take them with me. Buying them by the big bag is much cheaper.
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Dieting can be expensive if you have to buy special foods or a wide variety of different foods. Eating one serving of a low calorie or low sugar cereal twice a day will not only take the weight off, but will allow you to save lots of money on the grocery bill.
The best diet snack is protein. It will satisfy your hunger for a lot longer than carbs. A little peanut butter spread in a stalk of celery is great. A hard boiled egg is another great choice.