Grain berry cereal is usually similar to the cost of oatmeal, but prices vary by store. The price could be anything from a dollar and some change to around five dollars. You might find a better deal at a wholesale club like Costco or Sam's Club. The cereal is sold in small packages as well as large boxes, which will have different prices too. In general, you can expect to pay one dollar per serving size if you buy the small box but will pay more for larger sizes. The cost of grain berry cereal also depends on where you buy it. You can get this product at health food stores, grocery stores, and natural food stores. It is also sold online and at some convenience stores. Other breakfast cereals will have different prices. Some are more expensive than grain berry cereal while others are cheaper. Health food stores generally carry a large variety of cereals in all different sizes and prices.