There's no reason to buy that kind of thing here or anywhere else -- make it yourself. Buy a usb and install Tails on it, and use TrueCrypt for hidden volume encryption of the usb and/or any sensitive info. Buying it "premade" from anyone is risky because you can't know for sure what they put on it. It's not safe. There are tons of guides available, as ixcc mentioned, and it would be FAR safer to make one yourself.