I have gone to AC Moore and used JoAnn's coupons and Michael's coupons. Most stores will also honor their sale prices too. One time MIchael's had sizzix dies on sale for 50% off and A C Moore had them for 40% off and Ac Moore honored Michael's prices. You need to bring in the ad showing the prices..they keep the ad. In fact, some of my local scrapbooking stores accept the competitors coupons. They wiould rather give the discount on one item and then hope you buy other things in their store, than lose the whole sale.
It's always worth a try asking..all they can say say is no ..and maybe think about changing their policy.