: Focuses on science, history, and technology documentaries, starting at around $5.99/month.

: Known for deep-dive historical and military documentaries.

: Platforms like Apple TV and Amazon Prime Video allow you to buy individual titles to keep in your digital library. YouTube also features a vast "Movies & TV" section where documentaries like Free Solo are available for purchase.

You can buy documentaries through major digital retailers, specialized streaming platforms, or dedicated educational distributors depending on whether you need them for personal viewing or public use.

Rather than buying individual films, many enthusiasts subscribe to niche services that focus exclusively on nonfiction content: