Crest 3D White Luxe Whitestrips Professional Effects 20 Treatments + Crest 3D White Whitestrips 1 Hour Express 2 Treatments @ $32 after applying $12 coupon (can be found on details page, need to be clipped by clicking the green coupon button (in desktop) or applying checkbox (in mobile))
According to CCC lowest price since April 2016
https://www.amazon.com/gp/product/B00AHAWWO0