You just need to register for the Bestember event and it will be there. That's just how they've been doing all the exclusives for the most part like the Sideshow Con and such. It's hard to keep track if you're not in their Facebook groups and such. It becomes a pain, but it's usually worth it. Plus, you instantly get $10 reward points add to your account as well. So it's worth doing. They also just opened up registration for NYCC and you get another $10 for registering for that too. So there's $20 in rewards you can use on that stormie when he goes up
Sideshow New York Con registration link if you want the other $10
https://www.sideshow.com/events/sideshow-new-york-con