Jimbo -- Coke produced in Mexico is still made with sugar. Sometimes you can find it in Latino stores, or if you're near Mexico, just hop across the border. I saw somewhere that you might also be able to find it at Costco.
It also looks like you might be able to find it during Passover: http://www.nypost.com/seven/03192007/news/regionalnews/kosher__coke_a_big_hit_regionalnews_rita_delfiner.htm
It also looks like you might be able to find it during Passover: http://www.nypost.com/seven/03192007/news/regionalnews/kosher__coke_a_big_hit_regionalnews_rita_delfiner.htm