- Search for "92320" to find the Crest 2-Hour Express 4-Count Whitening Kit for $40.99
- apply coupon code "GOSUMMER" makes it $32.79
- redeem coupon code "SOAP20AFF" drops it to $26.23
- send in this $15 mail-in rebate for a final price of $11.23
Of note, the Crest 3D White Whitestrips Enamel Safe Professional Effects 20-Count Box (search for "60965") is available for the same price via the above coupons and this $15 mail-in rebate, another low.