Take a look at www.books4cars.com
as I bought the original genuine owners manual for my '99 Disco ll brand new,still in the wrapper.They have excellent customer service and a vast amount of literature(new),from owners manuals to workshop manuals and everything in between, for almost every Land Rover year and model,and other makes too.
Then if you are brave hit up some of the motorhead websites for parts. They have some of the higher end stuff on sale at prices RN and AB or any of the other sites can't touch.
For example. I got two Optima red tops for $90 ea from Summit last year. I put in the second battery kit (from Summit) for $100. So for the cost of one yellow top from RN or AB, I now have a :buttrock: battery system. I spent the extra money at partsexpress.com and got some zero gauge wire to wire it up.