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Riddle answer consists of 12 characters

A guy walks into a hardware store, and he grabs an item. He walks up to the counter and asks, How much for one? The guy at the counter says, 20 cents. He goes off and comes back and asks, How much for twelve? The guy at the counter says, 40 cents. He goes off and comes back and says, Ill take a hundred twenty two. The guy at the counter says, That will be 60 cents. What is he buying? (Two words)