https://www.humblebundle.com/books/warhammer-fantasy-rpg-cubicle-7-books
Humble Bundle are doing another big
RPG book bundle with Cubical 7! There's 50 digital books up for grabs from the 1st edition through to the 4th edition (not the 3rd which I think had a different publisher?). This is at least the second time they've done this and if you took part before there's a lot new here for you to get including the 4th edition core book.
If you're totally new to it all then the top tier is a solid choice for all the content.
If you took part before then you only need the second highest tier - the 24 item one at around £13.08. That adds all new things that you won't have got before.