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For a 120v 6amp charger, the price ought to be lower than 10*20 = $200, as that is the cost of 10 12v 6amp Harbor Freight chargers when they are on sale, or for a 120v 10amp charger, the price ought to be lower than 10*30 = $300 (those go on sale for $30 each sometimes). Well, maybe a higher price is acceptable since the charger would be smaller than 10 12v chargers.
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