Free White Castle Medium Soft Drink Updated on Oct 26, 2020 at 2:20 pm · Disclosure If you have a local White Castle, then you can use this no purchase necessary coupon good for a free medium soft drink. The coupon expires 8/30/20 and you can use the coupon each time you visit. I love a reusable freebie! Categories Dead, Food, In Store · This post may contain affiliate links. See my disclosure policy for details. Report a dead freebie! Similar Freebies and Samples!