Availability is sketchy and when you do find one, it's way too high. Feels like a few years ago again... what's up with that? Today's used prices are what they should be new.
Many are paying higher prices because they don't look into the Glock discount program. There are many that are eligible to get an LE priced pistol. They could also join the GSSF for about $30.00 and be eligible as well.
Sworn Law Enforcement officers, including Federal, State, County, & City
Includes retired L.E. officers with "retired" credentials.
EMT's, Fire Fighters, Volunteer Fire Fighters, and Paramedics.
Military personnel including Reservists and National Guard with I.D
Includes retired Military with "retired" credentials.
Corrections Officers, including Parole and Probation Officers.
State Licensed Security Companies (Loomis, RAM, etc.)
State Licensed Armed Security Officers.
Court Judges, District Attorneys and Deputy District Attorneys.
LE Academy Cadets with enrollment documentation from the Academy.
This is the list I found out from Ed's Public Safety who is a Glock Distributor and had the information on their website.