Ya, the price is a bunch of crap.
I'd say $35 to $40.00 for the power pack, so long as it is a good one with life time warrenty, etc. Like I picked up for my PC.
The case itself could go for $20 or $30.
They Keyboard, Mouse, etc adaptors should at most total them about $20 to make I'd imagine.
So in the end, I don't understand why they could not cut off $50.00, and still make a profit?