I can't see anywhere better to put this, but the BookDepository website is
running a competition to win a 13" MacBook Air by answering an easy
question - no purschase needed. The competition is open worldwide
(except Italy for some peculiar reason), so the chances of winning are
quite low. Entries close on 20 January, 2014 (UK time).

The rules here say because I'm "new" I'm not allowed to post links yet, so
just go to the BookDepository.co.uk or BookDepository.com website and
click on the Competitions in the navigation bar. :)