^SFoT was doing chips last year as well, even on single purchase paper cups. This allowed for free refills at self-serve fountains. I doubt that free refills was their intention...
Also, if anyone is looking for the cheapest Six Flags season pass, Mexico still offers one for less than 50 USD. It gets you into "Over Texas, Fiesta Texas, Over Georgia, White Water, Frontier City, Harbor Arlington, Harbor Splash Town, Harbor OKC, Mexico, and Hurricane Harbor Oaxtepec."