Crest 3D White Intensive Professional Effects (7 Count) falls from $64.99 to $38.16 at Amazon.com. Click on the "Clip This Coupon" button to cut it to $28.16. Choose "subscribe & save" to drop it to $26.27 with free shipping, the best price we could find by $29 (which was at Walmart.com). This whitener works with one 30 minute application per day. The 43 reviews so far average a 4.3-star rating. There is no sales tax (except in KS, KY, ND, NY, and WA). Note that you must cancel your subscription to avoid automatic future shipments.