We're still trying to get over the death of the Nexus One as a consumer phone, but at least Google planned on continuing to make it available to developers. And now it's official, available to devs for $529. You'll need to be a registered developer to get one (actually, you can buy up to 10), but at least the N1 will continue to live on. [Google Dev Blog]
Update: Yeah, you'll be buying the one with T-Mobile 3G.