Free Lego calendar for new sign up to Top Cashback. Go to Lego store and you'll get £25 cashback so just have to pay postage. I've ordered the Harry Potter one for DS.
Here is my referral code - if the next person uses this to sign up, I'll get £20 cashback. Then come back and post your referral link and the next person can use, and so on. 
www.topcashback.co.uk/ref/member979075781407