NMR Solvents

Cambridge Isotope Laboratories - Manufacturer of stable isotope labeled compounds and some fine deuterated solvents too.
www.isotope.com/

C/D/N ISOTOPES - Quite a large listing of deuterated compounds and Carbon-13 and Nitrogen-15 labelled compounds. In English or German or French.
www.cdniso.com/

Medical Isotopes, Inc. - Nearly a complete line of enriched biochemicals. Nice selection of fatty acids, enriched with C13.
www.medicalisotopes.com/

NMR Shift Reagents - Supplier of NMR shift reagents.
www.rareearthproducts.com/nmrshiftreagents.htm

Silantes GmbH - Stable isotope labeled biopolymers (H2, C13, N15)
www.silantes.com/