Activated Charcoal Home via Amazon offers the Moody Zook Charcoal Teeth Whitening Powder 2.7-oz Jar in Mint for $22.99. Coupon code "XCJRS8FZ" cuts the price to $7.99. With free shipping for Prime members, that's $15 off list, and the lowest price we could find, although we saw it for a buck less in another flavor last week. Deal ends June 29.