Buy extra blueberries now while they are at their prime and freeze them for using later. The secret to freezing blueberries is to make certain they are completely dry. First, pick out any berries that look bruised or shriveled. Then place the berries, still in their original rigid plastic container, in a resealable plastic bag. Or, transfer berries to freezer containers or resealable freezer bags. The berries will freeze individually and you can remove just the portion you need. Remember to rinse them before using. If you prefer to wash the berries before freezing, make certain that you dry them VERY well.