How about $400? No, seriously...
http://986forum.com/forums/performance-technical-chat/35080-986-five-speed-tranny-unmodified-audi-012-a.html
There. Saved you at least a thousand.
I was once looking around a junk yard after I had done a clutch job. I was among the transmission section helping a friend look for a transmission for a Mitsubishi Eclipse and noticed how similar a transmission on the shelf looked like to mine. As a matter of fact, it was the same, and it was labelled under the Volkswagen shelf.
If you actually take a look at your transmission on the Porsche you will see the volkswagen/audi logos on there!