Amazon offers the Eclipse Sugar-Free Gum 18-Piece Package 3-Pack in Polar Ice for $2.24. Purchase via Subscribe & Save to drop the price to $2.13 and bag free shipping. (Walmart sells it for slightly more with in-store pickup.) That's $1 less than what you can expect to pay in other local stores.
Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.