Both store have a way to sign up to receive their coupons through email. If you are in the states on a Sunday, you should be be able to get the coupons/ads by purchasing a local paper.
In addition do a google search for prinatable coupons. Also in my area Jo's and M's coupons are interchangable and Meijer, Walmart, and Target price match sale items as long as the price is printed in an ad, is not a % off and you have the ad with you.