Glock Collector's Association would be the best resource, but I'm not sure it's in operation right now. I know the Commemoratives pretty well, but I still hear of new ones fairly frequently (1x/2 yrs to 2-3x/yr). A lot of folks collect police-marked-only Glocks. Ray, the guy who started Glock Collectors Assoc. collected every manufacturing variation of the Glock 21, and he was up to 20+ in the first 5-10 years of collecting. I notice through this forum that there's a good interest building up in the non-standard production such as the gills and OD. Even with light interest in collecting them, it would be very expensive to collect one of everything at this point. I decided for financial reasons to focus on one area, which is why I've done commemoratives.
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