GLOCK Blue Label is not the same price sheet as GSSF. The GSSF is more limited, on models available, and generally run around $25, more, than the same model through Blue Label. As was noted, GT Distributors pricing is the best prices you can get, through Blue Label.
Blue Label firearms are limited to two, per year. Last year, I got four, from GT Distributors. The first was a GSSF Free Pistol Certificate (G45.5). This took a few phone calls as the KC store is new and they hadn’t seen a GSSF Free Pistol Certificate, before. After they called the corporate office (the same one I called before driving up there), I was given my choice. I ended up paying the difference ($77+ tax) to try the MOS system out. They figured it at the Free pistol being the base price $398.xx.
Then, I took my GSSF Pistol Coupon in. This time, I was limited to what was on the specific coupon I had, sort of. I came home with a G19 MOS w/Ameriglo sights. Again, I had to pay the up charge, for the sights. I was able to get the Amerglo sights, because that’s all they had. This time, they used the Blue Label price, plus the difference between the GSSF and Blue Label pricing. Later, I went and got my two Blue Labels, a G19X and a G23.5 MOS. Both of these were straight up Blue Label price.