Drupal t-shirts and other merchandise
Drupal does not have any official merchandise; however since the Druplicon logo is licensed under the GNU GPL some people have taken it upon themselves to make their own.
Profits should be donated back to the Drupal project; bear in mind that Cafe Press, Zazzle and Spreadshirt do take a significant portion of the price. If you have printable iron on transfers handy consider grabbing a high resolution Druplicon and making a donation.
Basic Druplicon
Designed by Michael Angeles
High resolution versions are availiable.
Lots of Drupal merchandise can be found at Drupal Warehouse including Drupalcon specific items. Proceeds go to the Drupal Association.
There is also a funny plush available at FreakyToy, one Euro from each sale is donated to the Drupal Association.
Revelinux promote Open Source projects including Drupal. 100% of the profit will go to those specific developers. They have a US Store and an EU Store.
Lots of Drupal merchandise can be found at http://DrupalWarehouse.com