$79.99
I think a lot of people are seriously overestimating the cost of the parts that will go into making one of these controllers.
It's not a standalone device; it has no CPU, GPU, system RAM, etc.
Beyond having the basic internals of the current Wii Remote Plus (less than $10 worth of components), the LCD display (maybe a $20/sub $20 part), the touch screen interface (resistive; low cost), about the only other components will be the signal processor and related components that relay AV/player input signal to the console itself; not expensive parts.