How do I get this icon? 1 year gift doesn't include a festive poro icon?

Edit: it's 10 year gift, messed the title :3 This one https://am-a.akamaihd.net/image?f=https://news-a.akamaihd.net/public/images/articles/2016/september/10-year/10YearAnniversaryPoroIcon-1.jpg

I mean you used the icon to promote the article, yet it is not available in the shop for IP..... please that poro is so cute (definetely more than riot kayle, right?)