This is too expensive, people here in China are selling this PCB for 340$, ever cheaper when you buy 10+ pieces 
Are sure that they sell the same thing with the same specific?
Yes, I know that design of the PCB, the second generation makes 420, even though 400 is more realistically. I have the blueprints
Pinwheels, if you're serious - feel free to send me an email. I have currently 120 pcs in stock. We are working in the third generation though, using
different chips, yet I cannot provide a date yet.