“On April 1, 2013, I stopped accepting orders for Casascius Coins from the public. I switched my website so orders can only be placed by resellers with prior invitation. I recommend and encourage sales of Casascius Coins by resellers. Over the last month, Bitcoin has become a lot more interesting to the world. Bitcoin prices have skyrocketed. Interest in Casascius Coins has increased substantially for multiple reasons that are seemingly working as a ‘force multiplier’. While I’m very excited to see this has happened, for me to be able to satisfy the market demand for Casascius Coins, I will have to make some major changes to the way they are made and shipped.”
http://casascius.wordpress.com/2013/04/01/orders-now-accepted-by-invitation-only/