YMMV S&S Coupon. Amazon has the 20-Count Amazon Basics 10-Day Teeth Whitening Strips Kit on sale for $13.59 - 25% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $9.51 with free shipping on $35+ or with Prime. Generic of Crest 3D White Classic Vivid No Slip Whitestrips ($30 for the same size).