No kidding FT, for example, this place is about 30 minutes south of me. Good people, very knowledgeable and they have a great selection. They have 3 used glocks in stock---

Gen 3 23 for $529
Gen 3 23 for $489
Gen 3 30 for $539

This is the only live example I have because they have a site. But it gives you an idea. Like with most used guns, there is room for negotiation, but still. That's a high starting point. To me at least.

Whether I decide to build a stripped frame, or and 80%, I'm going to tie up some cash also.

I would like to shoot a 3 and 4 side by side for 'research' but I agreee with sticking with the 3, I had not thought about having one to back up the other in case of a failure.