Warring Kingdom skins

So. Garen has one cool skin. 1. And its his Warring Kingdom skin. I am able to buy WK katatina, Nidalee and jarvan(this one is even on sale). I understand its supposed to be a seasonal sort of thing bt then why am i able to buy these three and not the one i want for Garen? I really find it odd how Riot apparently dont want my money oO
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