Instead of buying cereal in a big bag and box, make your own in less time than it takes to wait in the grocery checkout. Cost comparison: you can make 2 large batches of granola from 1 42-ounce oatmeal container, which runs about $2.50, which is the least that you'll pay for a one 15-ounce box of cereal. Taste comparison: no contest!
6-8 c old fashioned rolled oats
1 tbsp cinnamon
1/4 c honey (can increase if desired, but this is enough)
1/4 c canola oil (ditto)
Preheat oven to 300F and oil two baking sheets. Mix the dry ingredients in a large bowl. Mix the wet ingredients and warm slightly in a pot or the microwave. Pour over the dry ingredients and mix well. Spread on the baking sheets. Stir after 20 minutes, and remove from the oven after 40 minutes. Let cool and store in a container in the fridge.
1/2 c wheat germ: add at beginning to oats.
coconut: add toward the end of baking time (look for unsweetened, preservative-free coconut in bulk at natural foods stores).
nuts and dried fruit: add after removing from the oven.
hazelnuts and dried blueberries
pecans and dried cranberries
dried cherries and almonds
dried apricots (chopped) and walnuts
any of the above with chocolate chips, preferably Ghirardelli's bittersweet