As one of its daily deals, Amazon offers the Crest 3D White Luxe Whitestrips Professional Effects 20-Treament Pack with two Crest 3D White Whitestrips 1-Hour Express Treatments for $29.99 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, it adds $5.48.) That's $29 under the lowest total price we could find for these items sold separately elsewhere. (For further comparison, we saw just the 20-pack for $29 four days ago.) These strips purport to remove up to 14 years of stains. Deal ends today.