White Castle: BOGO Free Saver Sack Coupon July 28, 2010 at 5:00 pm by Cindy Livesey | Restaurant Coupons 1 Comment You can score a BOGO Free White Castle Saver Sack. You can head over here to print your coupon. Coupon good through 9/4/10. The links in the post above may be affiliate links. Read the full disclosure.