Discover card is running a DOUBLE cash back promotion for a short time next month. If you sign up now you can earn double cash back on grocery purchases from September 1st to September 4th.
Yes it is a very short time span but you can sign up now to earn cash back on the things you purchase every day. I just clicked my link and I am registered for it and ready to use my Discover card instead of the other card that I was going to use.
Remember this is only for a short time and the double cash back ends on the date listed.