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Dear Jeffrey

>1. Are there any NIST materials available that are certified for stable
>isotope composition?

You can obtain certified reference materials or materials with recommended
values from the IAEA. Write to:
Analytical Quality Control Services
International Atomic Energy Agency
PO Box 100
A-1400 Vienna
Austria

Fax: +43-2254-73951-222

and ask for their latest catalogue.

>2. How might I obtain the "most accepted" isotopic numbers for IAEA
>N-1, N-2, and N-3?

Recommended 15N values are:

IAEA-N-1: +0.4 
IAEA-N-2: +20.3 
IAEA-NO-3: +4.7 

Regards
Kevin