Are God-King skins Limited Edition?

Are God-King Garen and God-King Darius limited edition skins or will they be in the shop forever? I already have the Garen skin and I'm thinking about buying the Darius one. I just wanna know do I have to hurry up. Btw, I didn't know what board to put this thread in so I put it here in Champions and Gameplay, let me know if I made a mistake.
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