Some new arrivals to have an eye on:
The Fuchai Squonk 213 is $51.12 and looks pretty good! 150W for a single cell device is for sure exaggerated though even with 21700.
The Wismec RX2 is listed for $39.47 and takes 20700 too, not sure about 21700 yet. Hotecig has it for $30.15, FT need to adjust the price here soon.