This deal has ended.
Update: Temporarily out of stock. Shop4Tech.com drops the Desktop Newton's Cradle from $14.99 to $7.99. Better yet, code CC18 cuts it to $6.55. With free shipping, this is the lowest price we've ever seen. The classic desktop piece that displays the conservation of energy features five metal balls and makes a nice gift for your favorite desk jockey. There is no sales tax (except CA).