Well, I don't know if everybody knows this but I was looking the merchandise thread of lucky star and saw one promo card figure of Sousuke that once appeared on an lucky star's episode. The thing is that the card became real and now people can actually buy it.
Two words: I WANT!
I don't remember exactly which lucky star episode it was, it was when Konata goes to an anime convention...
Credits to:
MakubeX2