YMMV Double coupon method. Amazon has the 4-Pack Colgate Total Clean Toothpaste (5.1oz Tubes, Clean Mint) for $16. Here's how to drop is to $9.62.

1. Click the one-time purchase option, click the $2.26 off coupon
2. Click the S&S option, click the 20% off coupon.
3. Checkout with S&S to get the additional 5% discount. 

Should look like $16 - $2.26 - 20% off - 5% off = $9.62 with free shipping on $35+ or with Prime. That's roughly $2.41 per tube vs. $4.96 at Walmart.