Coupons.com has a $1 Off Any Robitussin Coupon that will allow you to snag Robitussin to Go for FREE at Walmart!
Here is your scenario:
One Robitussin To Go (2-pack): $1
–$1/1 Robitussin any product coupon
Please keep in mind that prices at Walmart can vary a lot, so I cannot guarantee that you will be able to find these are your store for this price. I personally only shop Walmart deals when I have to stop there for something else anyway. 😉
(Thanks STL Mommy!)