I would have to say they are always cheaper. Than the other prices.
I have seen some gun dealers take advantage of the less expensive price and increase their own cut on them..
There are two blue label dealers in town one sells them for $399 while the another sells them for $450.
Our only dealer does $425.00. Tupperware for the masses!
As others have said, blue label Glocks are for law enforcement officers, military, a host of other first responder types, Glock certified armorers and GSSF members. There is a difference between LEO pricing (including all the other groups except GSSF) and GSSF pricing.
Current GSSF pricing is $425 for a standard 9mm Glock 17 with standard sights.
Current LEO price is $398.20 for a standard 9mm Glock 17 with standard sights.
There seems to be a lot of confusion regarding the GSSF pricing scheme... Some dealers don't seem to really understand it and others try to take advantage of it. It looks like the dealer selling GSSF guns for $399 is using the LEO price-list... G23SNT, if you are in the military, or a LEO, that price would be correct for you.
The GSSF pricing is currently correct and the LEO pricing is about a month old, but still correct as I understand it.