I found a very interesting calorie counter on the web. Click the Source link below the quote and go to it.

What Does 200 Calories Cost? The Economics of Obesity
WiseGeek has an interesting article on What Does 200 Calories Look Like?, where it photographs the portions of several foods that equal 200 calories and sorts them by weight.
I thought it would be neat to extend this idea and see what 200 calories costs. So I extended my usual grocery trip by finding out the price per weight for each of the food items they selected. The results are below, grouped by price per 200 calories. Image credits go to WiseGeek.com. Please go there for the full versions, these are just thumbnails for reference. Source