How will I test the new skins?

As many of you know, testing for Patch 9.19 began today, and with that came the Immortal Journey (Morgana, Nami, Riven), Hextech Amumu and Championship Ryze skins. However, I am not able to buy these skins, which I also imagine is happening to other players. Could you put the skins in the store? (Sorry for any mistake in English, I used Google Translate)
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