Here is a nice Amazon deal for you. While supplies last at this price, Amazon has the HUGE 7.8 oz Colgate Total Whitening Toothpaste 3-pack priced at just $6.75 when you subscribe ($7.11 without subscription.) There is also a 15% off coupon you can clip on the product page that will bring the price down to as low as $5.68 ($1.89 per tube.) This item will ship with an Subscribe & Save delivery, so take those subscription savings.
HUGE 7.8 oz Colgate Total Whitening Toothpaste 3-pack – only $5.68 ($1.89 per huge tube) when you subscribe and clip the 15% off coupon on the product page