I don’t think it is out in retail stores yet, probably in a week or two, but I expect it to be out of stock the moment it is available in stores, like what happen to the Apple Lightning to USB Cable.
I have no idea why this adapter cost S$42 while the cable cost only S$28.
Apple Lightning to 30-pin Adapter
Plugged Into iPhone 5
Plugged Into Apple 30-pin to USB Cable