There is another printable coupon available to save on Diet Pepsi 2 Liters - Head over to coupons.com here to print a Buy One, Get One Free Diet Pepsi 2 Liter Coupon! This coupon is a manufacturer coupon, but does print with an HEB logo. Since HEB is the only local store that has specific wording in their policy that you they won't accept coupons with another store logo, you should be able to redeem this coupon anywhere. (I am under the Harker Height zip, 76548)
These do happen to be on sale this week at H-E-B so you can get the following deal there:
Use (1) Buy One, Get One Free Diet Pepsi 2 Liter Coupon
Final Price= .66 each!
**Savings Tip: At most stores you do NOT have to buy all 3 items in a 3 for $4 (or 2 for $5, $4 for $7, etc.,) . They word the ads like that so you will think you have to buy more. Walgreens is the exception...Their sales now include a single item price or the bulk price.