Best gift for a Red Rising fan?

Not sure if a post has been made about this yet, so I apologize, but I wanted to get my boyfriend some great Red Rising gifts! I know that they have a website (https://shit-escalates.com/patron-shop/) and sell merch, but anything that I'm missing that the fandom has come up with (Etsy, tiktok, etc), or anything I should know that's a need?