If you haven't seen it yet check out the Wrath and Glory Humble Bundle. For $25 you can get a ton of great TTRPG books set in 40k and of course help a good cause. It's a cool system and there's even the Space Marine 2 crossover content.

https://www.humblebundle.com/books/warhammer-40000-roleplay-wrath-glory-cubicle-7-books

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