The only way to become a "certified" Glock armorer,(and getting parts direct from Glock) is to attend a course hosted by Glock Inc.
Only way to do that is be LE or FFL/FFL employee...
If you are LE, call Glock direct at:
(770)437-4712
(770)319-4779 FAX
Ask for Sharon Zaffiro
She does Armorer Course scheduling...
You may be able to coordinate a deal with other local LE to "fill-up" a course to be hosted by Glock Inc at your dept...
I understand Frontsite is a top notch establishment, and if you don't fit into one of the above categories, they may be your only option...
I have seen all the armorer manuals and tools on eBay, and gunbroker.com...
Everything you need to know is in the modern armorer manual...
Glocks are one of the easiest handguns to strip down...
34 parts TOTAL...
Good luck...