There happens to be a Space Skull LEGO set on sale right now. It is normally $99.99! But you can get it now for $19.99! There is also a code out BSCD29 that allows you to get 5 off of 20! So if you add something small you can use it!
I bought one for Ethan, it will either be for his birthday or for Easter!
You can use the link above or go to http://shop.lego.com/Product/?p=10192
And hurry, this is discontinued and they have been having it in and out of stock since I bougt it last week.