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Don't have a source, but avoid paying for online/digital versions from third parties - they're inevitably pirated and most likely don't have the 997 Turbo specific content.
I'd be interested too. I did the stupid mistake a few years ago to buy a printed shop manual from Germany and it's crap with small, blurry pictures that are of no help
Alot of the guys would swear by the Bentley shop manuals over at the 996 forum. I have never used one and don't know if they have one for the 997tt. But a quick google search will answer that question I guess.