You can get these journals at Amazon, here. Although I only have the Asteroids journal, I can say that the fit and finish on these is excellent, with a nice glossy cover on thick stock and substantial writing pages. It’s definitely worth the modest asking price of around $10, despite the smaller size (roughly 6 x 5″) and minimal value-add of just a snippet from the Atari 2600 game’s manual in the middle of the journal.
Here’s a link to the book, Atari Flashback: The Essential Companion, mentioned in the video. It’s also around the same price as the journals.