Genuine Vision Mini Vivi Nova's can be got here:
Vision VIVI NOVA 2.5ml eGo Tank - All NEW Tank System with Replaceable Atomizer Heads - Latest in eCig Innovation
I've been dealing with this company since I started
vaping, and they are reliable, friendly, and ship fast.
As for the Kanger MT3, they do, in fact seem to be out of stock just about everywhere. Give it a few weeks. The Vendors are still re-building their stocks after the month-long shutdown of the factories in China, due to Chinese New Year. For real...