Walmart offers the Crest 3D Whitening System Kit with a $10 Walmart eGift Card for $43.97. This $10 mail-in rebate cuts it to $33.97. Pad your pre-rebate order over $45 (just $1.03 more) to qualify for free shipping; otherwise shipping adds $3.97. Assuming you'll use the gift card, it's the lowest total price we could find for these items purchased separately elsewhere by $18. Rebate ends December 29.