Na kagi, kaledos, nuolaidu metas :)

Is saito:

"How to redeem the offer
You must come via this link each time you wish to use the coupon code (or 
the redemption box won't show in the basket).

Then just enter the code HAPPY99X in the basket when you begin to checkout."

http://www.bookdepository.co.uk/nlxmas?a_aid=read-more