From the press release:
WALL-E #0
SELLS OUT!
GOES TO SECOND PRINTING

November 25, 2009 – Los Angeles, CA – BOOM Studios is proud to announce that WALL-E #0 has sold out completely, sending the title into second printing.
Fans should keep in mind, while Diamond Comic Distributors is completely sold out, first printings of WALL-E #0 may still [...]