Confirmed: Replacement Wii U Pads cost $150
Neogaf member Nbthedude was traveling with Delta airlines when they lost some of his bags that contained his Wii U power supply, sensor bar, and GamePad. According to this account Nintendo is charging him $150, plus shipping, to replace the lost GamePad. This is on par with the Japanese price of purchasing a Wii U GamePad at just over13,000 yen. ($145)
He is a screen grab of the actual e-mail receipt.