Dick's Sporting Goods offers the Penn Championship Tennis Balls 3-Pack for $2.09. Add them to your cart to drop the price to $1.67. With free shipping, that's tied with our mention from Black Friday week, and the best deal we could find by a buck. (It's a very low price for three tennis balls.) Deal ends December 13.
These little-known sections of Amazon.com are true hidden gems for deal-seekers and impulse shoppers alike.