Target offers the Mentos Gum Curvy Bottle in Red Lime Fruit (pictured), Spearmint, or Freshmint for $2.50. Opt for in-store pickup to avoid the $4 shipping charge. That's a buck off and the lowest price we could find, outside of the deal below. It includes 50 pieces.
A close price: Amazon offers it in Spearmint, Sweet Mint, or Cotton Candy for $2.90 with free shipping when you clip the coupon on the product page and order via Subscribe & Save.