Kai and Scott are right. Don't go to Cold Stone for sugar free ice cream. They don't have it.
For sugar free options you're always better off going to get a quart at the grocery store. The amount you'd get at cold stone for the price wouldn't be worth it, as you couldn't get very many mixins sugar free either and would probably just be getting plain flavored ice cream.
At this time, they do not have any sugar free options. They did say that other stores might have this option, but you would have to call each store to confirm. Coldstone's website does not show any sugarfree option either. Hope this helps.
Thanks! Your answer is awaiting moderation.