As you will be traveling, I would suggest the phone app, if you can. That way you have the newest coupons. BUT be aware, on and around holidays, is when they have the most coupons. Currently they only have one, 40% off for one regular priced item. Cruise their website while you are waiting and you will get a better idea of what's available. Labor Day just passed but these are coming up.
Columbus Day: second Monday in October
Veterans Day: November 11
Thanksgiving Day: 4th Thursday in November
Christmas Day: December 25