Got this promo code when I received mine in the post the other day. Can't vouch for it as have not tried it yet, but got guilted into buying one by a thread on MN the other week. They are normally £19.99 I think:
Just enter it on the order page.
Sorry, not the most glamorous of codes, but there you are
Thanks! I may use this as although I have a moocup already, I have a terrible habit oif hiding it (so the boys can't nick it to make a lego space observatory out of it ) and not able to find it when I need it...
For those who haven't yet taken the plunge, try it!