Walgreens has, in stock, Quilted Northern toilet paper, mega rolls, 6 pack. They are currently $5.99 each. There are three coupons. To get them for this deal you need an account with Walgreens, and need to be logged in. There are two manufacturer coupons for $0.50 and $1.50. There is also a mystery coupon that is being advertised on the website at the moment. You can find the $0.50 and $1.50 manufacturer coupons on the product page to clip. The mystery coupon link is at the top of the page, it says "Mystery deal Get Coupon". The mystery coupon for members SHOULD be $5 off a $20 purchase (for guests its code TAKE10 for 10% off a purchase of $35+). I can't guarantee it'll be $5 off $20, but that's what I got.
There are a few other coupons you can find under the "Weekly Ad & Coupons page" which you can clip for extra points. There is a 1000 point offer coupon, one for 10 points per dollar, and there's also a coupon for 5000 points ($5 reward) after making two purchases of at least $10.
Walgreens requires a purchase of $35 or more to get free shipping, but I guessed the code FREESHIP and it worked, no minimum.
$5.99 * 4 = $23.96
-$5 off $20
Edit: Why 4 units? Well, you need to get above $20 threshold for the $5 off $20 coupon. Side note, the purchase limit is 4 units.