May 4, 2013 is FREE Comic Book Day. Visit a participating retailer and you will receive Superman: Last Son of Krypton #1 while supplies last.
In addition, this Free Comic Book Day exclusive includes the first chapter of the classic, best-selling graphic novel SUPERMAN: LAST SON OF KRYPTON – written by Geoff Johns and Richard Donner (director of Superman: The Movie), illustrated by Adam Kubert and featuring Superman’s epic battle with General Zod and the Phantom Zone villains.
For young comic fans, DC is also offering DC NATION SUPER SAMPLER #1, providing a sneak peak at two sensational series from the DC Kids line – BEWARE THE BATMAN and TEEN TITANS GO!. – this book includes two exciting, all-new stories for readers of all ages, based on new animated series coming soon to Cartoon Network’s Saturday morning DC Nation programming block from Warner Bros. Animation.
This happens the first Saturday in May every year and is only at participating Comic Book shops. In my area, it looks like mostly specialty shops are participating. You can read an entire list of FAQs on freecomicbookday.com.