Head over to your local JCPenney where they are offering up mystery coupons valid for $10 off a $10 purchase, $100 off a $100 purchase or $500 off a $500 purchase! These mystery coupons are only available in-store while supplies last and are limited to one per customer. Note that most stores do not open their doors until 2PM on Thanksgiving Day. This offer is valid on November 28th only.