JC Penney will offer a Price Adjustment within 7 Days of your purchase (excluding Clearance merchandise).
JC Penney currently has no Rain Check Policy. Your best bet is to shop early when a sale is announced to get the items you want.
Old Navy offers hidden coupons weekly on their website. They are good for in-store purchases. Stay posted to Your Retail Helper to get the scoop on where and when to find these hidden coupons.