Walgreens has Mentos UP2U gum for $.39/pack. There’s a coupon on their September Savings Book flyer for $1 off 2 packs. Blogs are reporting that you can use the coupon unlimited times in 1 transaction. Please do not do this and avoid clearing the shelves! The coupon is on page 8 on the coupon book. The coupon book can be found near the entrance in Walgreens.
This deal has been reported to be at nearly all Walgreens, but since it is clearance YMMV