[hennie pennie]

Basically, it seems that people are focusing purchases on items for which Walgreens will give a "Register Reward."

They also try to use a coupon for both the initial purchase, and for anything bought with the Register Rewards.

Presumably, there also are still a few manufacturer's mail-in rebates around, too.

Here's official information from the Walgreens website:

[hennie pennie]

Coupon Policy Help | Walgreens Coupon Policy

As a customer-focused retailer, Walgreens encourages the use of coupons by our customers in our retail stores, in accordance ...

http://www.walgreens.com/topic/help/generalhelp/coupon_policy_main.jsp

Register Rewards | Walgreens

The Walgreens Jingle Ca$h coupon value cannot exceed the total purchase amount.

No cash back and no cash value for the Walgreens Jingle Ca$h coupon. ...

http://www.walgreens.com/topic/save-money/register-rewards.jsp