You can buy them.

https://www.amazon.com/Beatles-Anthology/dp/B00008GKEG

I’d love to know what you all think are the best books, documentaries, articles, etc I can read/watch ...I’m particularly interested in Lennon’s life

Reading:

https://www.amazon.com/Beatles-Anthology/dp/0811826848

https://www.amazon.com/Complete-Beatles-Recording-Sessions-1962-1970/dp/0600635619

https://www.amazon.com/Beatles-These-Years-Extended-Special/dp/1408704781

https://www.amazon.com.au/John-Lennon-Letters/dp/0316200808

https://www.amazon.com/Beatles-Book-Hunter-Davies/dp/009195861X/

https://www.amazon.com/You-Never-Give-Your-Money-ebook/dp/B003H4VYRE/

https://www.bookdepository.com/Beatles-Context/9781108419116

https://www.bookdepository.com/Beatles-Sixties-Britain-Marcus-Collins/9781108477246

Watching:

https://www.amazon.com/Beatles-Anthology-John-Lennon/dp/B00008GKEG

https://www.amazon.com/Eight-Days-Week-Touring-Years/dp/B01NA7F5E2

https://www.amazon.com/Imagine-John-Lennon/dp/B000AYELY2

https://www.amazon.com/John-Yoko-Above-Only-Blu-ray/dp/B07TNVWNNZ

https://www.amazon.com/U-S-vs-John-Lennon/dp/B000LP5CX4

https://www.amazon.com/All-Together-Now-Documentary-Film/dp/B0032E9I6S

https://www.amazon.com/Good-Ol-Freda-Kelly/dp/B00F6SHD60

https://www.amazon.com/Lennon-NYC-John/dp/B003YGC7VM

The Beatles Anthology https://www.amazon.com/dp/B00008GKEG

The Beatles Anthology https://www.amazon.com/dp/B00008GKEG

but it only seems available on VHS, expensive eBay buys, etc. Am I missing something?

It would seem so.

https://www.amazon.com/Beatles-Anthology/dp/B00008GKEG