Free Slider and Drink at White Castle (May 15, 2018) This deal was posted on May 15, 2018 at 3:12 pm by Amanda (Moderator) Facebook Pinterest Twitter Here is an offer where you can get a free single slider, and a small drink at White Castle. Click the link below, to get your coupon. Valid May 15, 2018 only.GET COUPON HERE Don’t Miss out on FREE Money!FREE $5 MONTHLY from Savvy ConnectMilitary Families: Earn Gift Cards for SurveysThis app will pay you to install it on your smartphoneEarn Amazon Cards with Market Agent