Try the Peptide Synthesis Database (PSD)
http://aminoacid.bri.nrc.ca/home.html
they list several suppliers for the aas you want.
I too have had problems finding it sometimes;
perhaps because the name PSD doesn't jog the
right brain cells when I look through my bookmarks!
Judy
----------------------
Judy Hardy
Department of Biosciences
The University of Kent
Canterbury
Kent CT2 7NJ
U.K.
Tel: +44 (0)1227 764000
Fax: +44 (0)1227 763912
J.Hardy@ukc.ac.uk