Free Tissue at Walgreen's

I made a quick trip to wags to get some things and I bought Walgreen's Big Roll 1000 Tissue since it would be 2/$1 after the in ad coupon. Much to my surprise they were ringing up $0.50 ea making them free after the in ad coupon. YES! Free tissue at Walgreen's! I don't know if this is happening at all stores but there's no shame in trying. I bought 4 rolls and intend on going back tomorrow for more.

Scenario:
Buy (2) Big Roll 1000 Tissue, $1
Use (1) in ad coupon for 2/$1(Last Page in Ad)
Final Price: FREE!