Zero no Tsukaima Sankusukyanpen is a campaign launched to conmemorate the novel for having sold 1.25 million copies in Japan.
The campaign will yield as prizes the anime DVDs, magazines, editions, and other stuff of paraphernalia. Plus a special prize for the first 100 fortunates to send in a ticket coming from the releases.
Source.
http://www.animenewsservice.com/