Diet Soda w/o Aspartame or Sucralose (in US)?

I want to avoid aspartame and sucralose but still have the occasional soda. (Let's save the "diet soda is evil" comments for that other thread to save time, shall we?)

Does anybody know of a diet soda available in the US that still uses saccharine or maybe stevia? Even tab now adds aspartame. Even acesulfame K is okay with me if that's all I can find.

I'd rather avoid having to make my own because soda flavors tend to linger in rubber and plastic and I'd have to replace all the seals and lines in my kegs.