Crest toothpastes are on sale for $3.99 this week at Walgreens. Buy four in a single transaction and receive a $6.00 Register Reward, redeemable for store credit on a future shopping trip. Use four $2.00/1 Crest coupons. Because the Crest coupons have limits of one and two, use them from different sources. Use one printable coupon, two Procter & Gamble newspaper coupons, and one clipped digital manufacturer coupon. The final price is $0.49 per toothpaste!