Wild for Wags has some great weekly scenarios for Walgreens this week, click here to check them out! Also, just learned that my Publix will take Register Rewards (RR), only because these are Manufacture Coupons, and will scan at check out. I'm not sure if there is a limit of how many RR you can use but I had one on me yesterday when I did a quick run to Publix for some last minute need items and used it without any issues.
I recommend checking this out and giving it a shot. Walgreens is a bit trickier than CVS because you can't have more coupons then items, and if you do you have to throw in a "filler item" to make sure you can use all the coupons.