I got an e-mail this morning ' Come back we miss you'. My first thought was you were obviously not paying attention and then realised it was for a different e-mail address than the one I used at the weekend.
The code is yournext738 (50%) Expires: March 9, 2014
The link was for theses books
http://www.kobobooks.com/lists/save/...ign=prechurnUS
but you could try it with other books to see if it works