Amazon offers the Crest 3D White Whitestrips Luxe with Advanced Seal Technology 14-Treatment Kit for $25.96. Clip the $5 off coupon on the product page to drop it to $20.96 at final checkout. Plus, Prime members receive free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $5.48.) That's tied with our mention from a year ago and the lowest total price we could find by $11. The kit includes 28 strips (14 top and 14 bottom).