I searched their site using: federal 124gr 9mm
and found these. They also sell it 500 or 1000 rounds at a time, which of course is cheaper per round.
The pictures show that both boxes say "law enforcement", and the text under the HST listing says that it's Federal's policy to only sell this to LE & military, so this is a limited supply.
9mm Federal Law Enforcement Tactical HST 124gr. +P Hollow Point Ammo
9mm Federal LE Tactical Hydra-Shok 124gr. +P+ Hollow Point Ammo
ETA: dangit, now you've got me off shopping again...