Pistol-Forum which is mostly vouched LE or industry folks (lots of national trainers there too)
And the store/range j use to teach at is a blue label dealer and I talked to the owner today and he confirmed it.
Apparently it’s more on the end that Aimpoint is knocking out the COA’s as fast as they can but the LE demand is out pacing them so Glock has temporarily halted all but agency orders for COA models.
Regular or MOS Glocks you will still be able to get!
Here is a notice from GT Distributors a large Glock distributor as well