Nicotine River used to carry Chemnovatic. But I don't think they do any more.
I have both Chemnovatic and CNT brand Nicotine Base. They are Both Very High Quality. But if I had to Pick a Winner, I would give the slight Edge to CNT.
You can also get CNT at Heartland Vapes or LiquidBarn. Both of which I believe are still taking orders.
CNT, Chemnovatic and Nude are the top three in my book. Not necessarily in that order.