This week at Walgreens, select Colgate toothpastes, toothbrushes and mouthwashes are on sale for $2.99. Buy any three and earn a $6.00 Register Reward at checkout, redeemable for store credit on a future shopping trip. The best part? You can combine coupons with the sale price and Register Reward! Use three Colgate coupons and a MobiSave offer for a final price of $0.21 per toothpaste.