An easy, astounding trick that can be presented in a number of ways- you get lots of magic for the money!

 

A regular coin is placed on the base then covered with a top that has been previously shown empty. This coin can vanish, change into another denomination coin, change into a small note, or magically turn itself over. You can use it as a coin production, or to switch coins for mentalism tricks as a way to produce the coin with the predicted date!