Don't forget to sign up for store flyers!
For example, I made a Target registry when I was pregnant and it put me on a mailing list. I got in the mail their back to school catalog with over $60 in coupons! Even if you aren't expecting, or getting married, or any of the other things registries are known for, you can still make one, make it private and just add some little things. This puts you on their mailing system! (Also with wedding registries they give $20 gift cards from time to time and Shutterfly gift cards)
I sign up under multiple names for coupons from Huggies and Pampers. BRU also has a good mailing list!