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About one-third of U.S. homes use a stand-alone freezer rather than relying on the smallish freezer attached to their fridge. In some states that figure is much higher; North and South Dakota have freezer ownership rates of 64% and 65%, respectively. While a new freezer could cost as little as a few hundred dollars, the price can shoot up to as much as $2,000 or more depending on the size and…