The only site I know selling blue/rainbow Nano is Element vape.
I believe fasttech will sell Nano in that 2 colors eventually, just like the bronze color ipv Vesta, in the past I can only buy it from Gearbest, but now Fasttect also sells it...
My hesitation is whether I should buy a IPV Velas in the same order. I like the fact that this mod is very light, almost half the weight of most of my other mods.