I always have sweet berries (blueberries, strawberries, blackberries) at my house. When there's a great sale on them, I buy as many packs as I can pedal home on my bike.
Then, I wash them, dry them just a bit, and spread them out on a cookie sheet lined with saran wrap or parchment paper to freeze. After they're frozen, put them in freezer bags till you need them. They should come out of the bag individually instead of in one big blob.