HI Mike--

try: http://www.spectrastableisotopes.com/Catalog/Specialty_Gases.aspx
1L, 95% 15N, $320.00
ICON carries it too: http://www.iconisotopes.com/Code/NitrogenC.asp#A
(along an agronomic line of 15N stuff)

and don't forget to check out the isogeochem website:
http://www.eeb.cornell.edu/isogeochem/Stable%20Isotope%20Suppliers.htm

take care

gerry

Michael Kubo wrote:

> Hello All:
>
> I’m looking for a supplier of enriched (hopefully ~50 atom percent at 
> least) N15 compressed nitrogen gas. I checked the archives with no 
> success, although I’m sure someone else here has posed the question 
> before. Has anyone ever had luck with this?
>
> Cheers,
>
> Mike
>
> Mike Kubo
>
> NASA Ames Research Center
>
> M/S 239-4
>
> Moffett Field, CA 94035
>
> (650) 604-6110
>