I did a little research and quickly learned more about this delectable cookie and its exciting journey to the United States:
"Tim Tams were first put onto the market in 1964. They were named by Ross Arnott, who attended the 1958 Kentucky Derbyand decided that the name of the winning horse Tim Tam was perfect for a planned new line of biscuits. The new biscuit was based on the existing British Penguin biscuit.
Tim Tams were introduced to the U.S.A. through Pepperidge Farm as a promotional item from November 2008 to March 2009. They were sold through Target stores only; varieties offered were Original (sold as Chocolate Crème) and Caramel. Pepperidge Farm re-released these two varieties with Classic Dark in October 2009. That time the Original and Caramel varieties were available in supermarkets other than Target and they were available in the US until March 2010. In late 2009 Pepperidge Farm announced that they would be available in the future at the same time every year, from October to March."
So anyway, I still think the authentic Arnotts brand ones are better. BUT...the next time you go to Target, I highly recommend picking up a package and indulging along with an icy cold glass of milk. Let the Tim Tam melt in your mouth. There is nothing like it. G'day Mates!