Aug 19 1991 FREE Medium Slurpee at 7-Eleven (Text required) Posted on August 19, 1991 by DealFinder Rating: 2 Posted By: SweetClover Views: 641 Replies: 0 To get a FREE Medium Slurpee at 7-eleventext message SIXFLAGS to 711711 to get a coupon for a Free Medium Slurpee at 7-eleven. This offer expires 12/31. Fatwallet.com Free Stuff