Current products available for sale:
฿1 Casascius Coin
฿25 Casascius Coin
Casascius 2-Factor Gold-Plated Savings Bar
How they work: The "private key" is on a card embedded inside the coin and
is protected by a tamper-evident hologram.  The hologram leaves behind a
honeycomb pattern if it is peeled. If the hologram is intact,
the bitcoin is good. If you have purchased a 2-factor item,
the private key is encrypted and will need to be decrypted using your
original preselected passphrase before you can redeem the funds.

http://highpayingbitcoinfaucets.blogspot.co.nz/p/bitcoins.html