Jennette has a review on her blog of Fiber One's muffin mixes. Here's the ingredients list photo from her page. Compare this to the list of ingredients for the whole wheat/corn muffins I made yesterday:
1 1/4 c. whole wheat flour
3/4 c. cornmeal
1 c. skim milk
1/4 c. coarse grits (softened by soaking them in the milk)
1/4 c. honey
2 tsp. baking powder
I think I forgot to add the oil but normally there would be 1/4 c. canola oil in there too. You pour them into muffin cups and bake them at 400 degrees for 12-15 minutes. I got the recipe off the box of cornmeal and only made a couple of modifications: Adding the grits, changing the white flour to whole wheat, swapping honey for sugar. And forgetting the oil, but that isn't so much a modification as a goof.
None of these ingredients cost me anything because I already had them all in my pantry.
I'm not sure how much the muffin mix would cost at a grocery store but my guess is it would be around $5 a box. You add water, eggs, and oil to the mix. If I had to go buy all my ingredients besides the oil and eggs, I'd probably spend about $10, but I'd get sick of the muffins before I ran out of the ingredients to make them.
The homemade muffins have 6 more calories per muffin, 3 grams less fiber, and 2.5 grams more fat (unless you forget the oil). But, on the plus side, the homemade muffins don't have Frankenfoods ingredients and since they were real food and not diet food, you wouldn't be tempted to eat 10 of them because they were so healthy. Obviously these were not as sweet, either, so it's not a totally fair comparison, but I just think it's interesting to see how sneaky these so-called diet foods can be.
Here's a side-by-side comparison of the nutritional data (data for my muffins was calculated using the cool tools at nutritiondata.com: