Sorry, I seemed to have explained things rather broadly before, which led to some misunderstandings, so let me add a few more details for everyone here.
As for the physical book, there will be a livestream signing event when the time comes. It will probably also be available on Taobao and similar platforms, so everyone can purchase it as they please.
There will also be giveaway lotteries in places like the Bilibili and Weibo full-subscription groups. I'll post a separate chapter to remind everyone when the time comes.
As for the merchandise gift packs, since they're meant as a benefit, they're currently giveaway-only and not for sale. There will also be lotteries in the Bilibili and Weibo full-subscription groups, with free giveaways.
The full-subscription group number is also in the book's description.
Bilibili ID: Fox Tail's
Weibo ID: Fox Tail's Fury
As for the specific merchandise, the Operations Officer has already posted it in the Book Friends Circle.
Of course, those are only samples. There will be merchandise for all sorts of characters when the time comes.
The characters currently confirmed are Li Huowang, Bai Lingmiao, Zhuge Yuan, Li Sui, and Yang Na,