Walgreens typically has a great monthly Instant Value Coupon Booklet available near the entrance of the store. These booklets are full of Walgreen's "Instant Value" store coupons that you can stack with a manufacturer's coupon to get a great deal! :-)
Wild for Wags has a nicely categorized list of the coupons available in the May 2011 Walgreens Instant Value Coupon booklet!
View Walgreen's April Coupon Booklet, valid 3/27 - 4/30, 2011 HERE
View Walgreen's May Coupon Booklet, valid 5/1 - 5/28, 2011 HERE