Hi @jamesstack
Here might be some helpful suggestions.
A recent book by a highly respectable opening authority (Delchev) is The Safest Grunfeld Reloaded.
Avrukh is another opening book king, here's his most recent volume on the Grunfeld. I found it to be a concise, excellent book. Not overloaded with variations, but sound nonetheless. Here's his volume 1, as well.
Also elite trainer Jacob Aagard's Starting Out: The Grunfeld Defense may be of interest for someone of your level.
A palatable Grunfeld guide that's quite affordably priced is Chess Explained: The Grunfeld. Clear explanations of idea/plans for both colors.
There are obviously tons of more books & DVDs but these are my top picks as a titled player...
Please let me know if this helps!
2Bf41-0
Im thinking about learning to play the Grunfeld as black. Anybody know any good books?