Sherry Anderson recently won a $500 Mastercard® statement credit in the Priceless Surprises® Sweepstakes. From now until June 30, 2019, every time you use your Oklahoma State Bank Mastercard, you will get a chance to be surprised with an unforgettable vacation or a $500 statement credit from Mastercard. One OSB customer per quarter wins a Priceless Surprise. Will you be next? Learn more here.