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Warm Mart via Amazon offers the Sodial Newton's Cradle Balance Balls Desk Toy for
$2.89 with free shipping. That's a buck under our August mention of a similar model and $3 under the lowest total price we could find for any Newton's Cradle elsewhere. This scientific tool demonstrates the laws of conservation of momentum and energy.
Update: The price increased slightly to $3.26 with free shipping.
Westminster 2507 Newtons Cradle 2.75 Inch - Pack Of 24, a similar product, is available at these stores