Score a FREE Ferrero Rocher (King Size) at Casey's General Store today as part of Casey's 24 Days of Rewards! Limit (1). While supplies last. At participating locations. Find this in Offers under the 'Rewards' section. Save offer in the Casey's app or online to redeem in-store. You must be a Casey's Rewards member (free to join) to get this freebie. As a Rewards member, you'll earn points on all your Casey's purchases – in-store, online, or at the pump.