Apparently, there is. The original Dr. Pepper plant in Dublin, TX, still uses the original formula with Imperial cane sugar and sells their product online.
"As the owner, Bill (Kloster) continued to emphasize those same values he had learned as a young man. He held on to the original drink formula, the antiquated bottling equipment, and a massive assortment of Dr Pepper collectibles which became his passion. Through the years, he used those elements to develop a successful enterprise and a popular tourist attraction. And most important, he built a fiercely loyal following for Dublin Dr Pepper around the world. The media were drawn to him like bees to honey and dubbed him “Mr. Dr Pepper.”
When bottom line indicated the tiny Dublin plant should give up Imperial Pure Cane Sugar in exchange for less expensive corn sweeteners, Bill balked. He continued to subscribe to the country theory of “dancin’ with who brung ya,” refusing to change the recipe which has always given the local product its unique taste. Bill Kloster, the Dublin bottling plant, and Dublin Dr Pepper remained true to themselves."
History of Dublin Dr Pepper
Where to order Dublin Dr Pepper