Note: the offers mentioned below are subject to change at any time and some may no longer be available.
If you ever shop at Target, you should have a Target REDCard. It comes in both credit and debit forms, and both save you 5% on almost everything Target sells. But if you want a little added incentive to sign up, if you get the card between now and September 28, Target will send you a $50 off $100+ coupon in the mail. It has a few restrictions, and expires on November 16, but Target sells an awful lot of stuff, so you should have no trouble using it.
The best part of the REDCard: You don’t have to carry it. You can link it to the Target app on your phone, and use that at checkout at any Target store.