We found 3 Reddit comments about Warhammer Fantasy Roleplay Rulebook. Here are the top ones, ranked by their Reddit score.
This is the link to the core rule book for First Editionhttps://www.amazon.com/Warhammer-Fantasy-Roleplay-Perilous-Adventure/dp/1899749012
This is the link to the Second Edition core rule book: https://www.amazon.com/Warhammer-Fantasy-Roleplay-Rulebook-Green/dp/1844162206
Third Edition comes in a boxed set.
Your best bet for finding the first two is used on ebay or from a google search. The Third edition box is FantasyFlightGames.com or ebay. Good luck!
This is 3rd Edition from fantasy flight games. I don't like it because they added a lot of special dice, cards, and things like that. If you like Edge of Empire you might like it. 2nd edition is similar to the Warhammer 40k games, and is what the Dark Heresy and the like were based off of. This is 2nd edition. I have not played first, but 2nd is what I would probably recommend. There is also Zweihander which I have not played but is supposedly a free, fan made, spiritual successor to 2nd I have heard good things about.
Afraid I won't be approving your post under Rule #2 as I consider it to be low effort but primarily because if you're after 2nd Edition books the way of getting your hands on them is well known and I'm happy to share.
You'll probably already have found the official PDF source which is here:
The best source you'll find is Amazon, it's a bit hard to search for them so start with the 2nd Edition core rulebook and look through the relevant items:
Please note however that it's not gonna be cheap. Core Rulebook usually fetches about £70-80 but it's slowly getting more expensive. Other books will vary between £40-60 depending on value, but you may occasionally catch something for cheaper.
If you're UK based then rarely stockers like WHS Smith can have them online, but it's mostly dried up and you'll probably only be able to get 3rd Edition material.
Your last main option will be Ebay, and there's often the basic stuff for the same price as Amazon that you can buy without bidding but if you do want more advanced stuff be prepared to fight for it:
I hope this helps, it can be a real challenge getting a hand on these books. For 2nd Edition they are not at least 10 years old, the core rulebook is now 13 years old.
Please do post again if you have follow up questions or want to share what adventures you get up to :P