It's probably grabbed from eBay or etsy. These puzzle boxes do one gimmick from the film. Some of the really expensive ones do like 3 gimmicks. Sliding, turning, a piece rotates and click in, something.
Here's an update from an interview he did a few months ago, which hopefully means new books will be released in the near future - https://clivebarker.info/ints24.html
If you want actually good deals don't use Temu or Alibaba, use those amazon return/overstock bidding sites. Just the other day I got a 2-arm VESA mount for $3 and it works great. Thing id like 30 pounds of steel and normally costs a hundo brand new. Only problem was some missing screws that weren't even necessary to the functioning of it.