Walgreens Out Of Robitussin To Go?

Just got a heads up from Ann at Coupons Deals and More that there may not be enough Robitussin to go in your area. If there isn’t, look for this sign on the shelf:
.
In the 10/25 ad, we are advertising Robitussin To Go, $2.49 – $2.49 Register Reward = Free. Due to manufacturing difficulties, we may not have sufficient inventory to cover this ad.
.
We are offering Robitussin DM Cough Syrup, 4oz (WIC 511399 only) as a substitution. Please note: The Robitussin DM Cough Syrup, 4oz is also in the ad on sale at $4.99. Continue to sell this product at the $4.99 sale price until you run out of Robitussin To Go.
.
If you run out of the Robitussin To Go, please follow the instructions below for the substitution:• Post apology sign at shelf where Robitussin To Go was merchandised.• Print the coupon in the link below and hang at your registers. In order for the substitution to work and trigger the Register Reward, the coupon must be used in the transaction.

She did the deal 4 times this morning (separate orders):

Robitussin DM Cough Syrup, 4oz (WIC 511399 only) $2.49 after the cashier applies the coupon at the check out
- $2 printable = 49¢ + receive $2.50 RR!
http://www.robitussin.com/ $2 printable
There was also a $1 manufacturer coupon in the 9/27/09 RP inserts.
.
See the rest of her post here.