There is a $1.10/1 Crest Rinse coupon. You can pick up Crest Pro-Health Mouthwash for $0.89 after coupon and reward at Walgreens
Here is how:
Buy (1) Crest Pro-Health Mouthwash 16.9 oz $2.99
Use (1) $1.10/1 Crest Rinse coupon (use zip code 77477)
Pay $1.89
Get back a $1 RR
$0.89 after coupon and Rewards