What I found when I was at Giant last week for an example..
Green Peppers were $0.25c lb cheaper by buying them in a prepacked bag that was labeled GREAT VALUE.. when in fact I'm sure they are the same peppers!
Price Per Lb Chart
What is in season this month? (this means it will be cheaper!)
Apples
Asparagus
Beets
Cabbage
Cauliflower
Cherries (tart)
Cherries (sweet)
Lettuce
Mushrooms
Onions
Peas
Spinach
Squash (summer)
Squash (winter)
Strawberries
Tomatoes