The level 90 justice and valor points vendors are now in Pandaria, Townlong Steppes zone, Niuzao Temple.
Townlong Steppes is the western (green) zone from Pandaria. Both vendors can be found on a platform behind the temple. They are two pandas.
The vendors got moved here so players will leave the main cities more often. Stormwind has now, only level 85 justice and valor points vendors.
If you plan to grind points, it is a good idea to “make your home”, an inn from this zone.