I'm an expat living in China. I just bought my 16GB Mi4 from their official website. I was hoping for the 64GB but the sales person over the phone has said they are out of stock for several months now!
I guess Xiaomi cares more about making money from mainstream markets than the high end markets. I like MiNote in general but the size is just too big for me. Mi4 on the other hand is just the right size. I am exploring a switch to Moto X 2014 instead.