If you have a Volume Licensing agreement then the final System Center Configuration Manager 2007 code is available on https://licensing.microsoft.com.  It seems that a lot of people are having a hard time finding it so here's a tip: Search for "Config Mgr Svr 2007" under downloads and you should find it.  Here's a screen shot if that helps:

System Center, Configuration Manager, Config Mgr Svr, Licensing, Microsoft

Source:→ TechNet Blog