From the press release:

AGE OF X Keeps Flying Off Store Shelves!

Age Of X is the story that just can’t be stopped! After selling out the first two issues, Marvel is proud to announce that chapters three and four of Age Of X will be back on store shelves this May with X-Men: Legacy #246 and New Mutants #23 Second Printing Variants! With the talents of New York Times bestselling author Mike Carey and acclaimed artists Clay Mann and Steve Kurth at the helm, now is the time to discover why the red hot X-epic of 2011 continues to shatter the expectations of fans, retailers and critics alike!

“There is definitely a mystery here, and thanks to the previous two issues of this crossover, I cannot wait to see how Mike Carey unravels the rest of Age Of X.” – Dan Iverson, IGN.com

“Mike Carey’s Age Of X crossover is shaping up to be a great ride, one which I catch myself wishing wouldn’t end. This is easily one of best X-books I’ve read in the last year.” – Kelly Thompson, ComicBookResources.com

“If you haven’t been reading this event you are missing out on one of the most creative looks at the X-Men since Stan Lee breathed life into five teenagers trying to save themselves…” – Chris Bushley, CosmicBookNews.com

“[New Mutants #23] is the best chapter yet of this short-term epic.” – Shawn Hill, ComicsBulletin.com

“Age Of X may be the X-Men story that Mike Carey was always meant to write.” – Jennifer Margret Smith, Newsarama.com

There’s no escaping the Age of X now! Magneto and Rogue are about to stage a jailbreak that could that could turn the tide in mutantkind’s war for survival. But just who has been shackled away…and what significance do they hold to this world gone awry? Catch up on the story that will profoundly affect the X-Men when the X-Men: Legacy #246 and New Mutants #23 Second Printing Variants arrive this May! Miss out on the first few chapters? Be sure to head on over to your local comic shop and catch up now!

AGE OF X: CHAPTER THREE
X-MEN LEGACY #246 SECOND PRINTING VARIANT (FEB118274)
Written by MIKE CAREY
Pencils and Covers by CLAY MANN
Rated A…..$2.99
FOC – 4/18/11, On-Sale 5/11/11

AGE OF X: CHAPTER FOUR
NEW MUTANTS #23 SECOND PRINTING VARIANT (FEB118273)
Written by MIKE CAREY
Pencils and Covers by STEVE KURTH
Rated T+…..$2.99
FOC – 4/18/11, On-Sale 5/11/11

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1. X-Necrosha & New Mutants #6 Sell Out and Go Back for a Second Printing
2. X-Factor #205 and X-Men Legacy #236 Sell Out and Return with a Second Printing
3. Preview: New Mutants #22 - Age of X: Chapter Two
4. Iron Man Legacy #1 & Black Widow #1 Sell Out and Get a Second Printing
5. Amazing Spider-Man #636 & #637 Sell Out and Return With Second Printings!