Celebrate 75 years of the Caped Crusader with this awesome Batman 75th Anniversary DC Comics Justice League Morphing Mug. 
This color Changing Ceramic Mug is heat-activated. When your hot drink goes in, it reveals the hidden image. It will hold 11 oz of your favorite drink and features images of a whole bunch of classic Batman comics. This mug is fun to drink from and fun to look at.
Only $18.99 from Entertainment Earth. Pre-order it now for September.