The Peanuts collaboration is supposed to go until October 31. I flew JX back in June. The collaboration on the plane gets you a few items like a set of playing cards, some stickers, and a gift bag. In economy you get a Peanuts themed amenity kit too. But it's nothing to go out of the way for. The other merchandise you have to buy from 7-11 in Taiwan.

I really enjoyed my Starlux flight though and would recommend them.