If you don't know already, then call your local comic shop today to find out if they are one of the thousands of shops around the country participating in Free Comic Book Day-- this Saturday, May 3rd!
If you don't the history of FCBD, let me fill you in: Free Comic Book Day is an annual promotional effort by the North American comic book industry to help bring new readers into independent comic book stores. Brainstormed by retailer Joe Field of Flying Colors Comics in Concord CA in his "Big Picture" column in the August 2001 issue of Comics & Games Retailer magazine (which no longer being published), it was started in 2002 and is coordinated by the industry's single large distributor, Diamond Comic Distributors.
On Free Comic Book Day, participating comic book store retailers give away specially printed copies of free comic books, and some offer cheaper back issues and other items to anyone who visits their establishments. Just to let you know, retailers do not receive the issues for free; they pay 12-50 cents per copy for the comics they will give away for free. So get there early to get what freebies you can and show your gratitude by buying a graphic novel for your mother (it's Mother's Day in just two weeks, y'know!).