In addition to the printed one that AZhitman talks about, you can get it in scanned PDF format from
http://www.nissan-techinfo.com/infiniti. Costs 19.95 for 24 hour access, which can be used to download the manual and TSB's for a given year in a few hours if you have a reasonably fast access. It is about 40 MBytes for the manual, and 35 MBytes (or so, I forget exactly) for the TSB's.
Z