Well this Instructable is right for you! This instructable is a pen safe. It is the epiphany on the "use it again" campaign. No need to throw it out. Put money in it!
Go to next step for the Items you need.
Step 1: Items you Need
(1) Pen you do not need anymore
(1) Dollar bill, or paper money you wish to hide from your enemies.
Thata about it!