Huh. I DIY for the most part, and the only "cola" flavor I have is cream soda. I'm not particularly fond of it, but I haven't seen too many "cola" vapes in my travels. IDK if this has anything to do with trademarks and etc. I do think creating a coke or mountain dew flavor might present difficulties. I don't know of any such vapes (although, that doesn't mean they aren't out there). Best of luck in your search!
Anna