Network Imaging Software

I looked for this around the forum and couldn't find anything recent, but maybe I'm just using the wrong terminology. I do some training classes in a room with 12 PCs and am looking for a way to quickly image all 12 devices after every week or so. They are a combination of 2-3 different types of machines, but will all be running the same OS. I was looking for something free or relatively inexpensive way of imaging the all of the PC's through a network from a server. I know Norton Ghost can do it, but I was hoping to find a free or cheap way of doing it without having to rebuild each machine manually. Any suggestions?

 

Do you have access to Windows Server as part of your education establishment? If so, you could use Windows Deployment Services to achieve the same aims.

 

Clonezilla gets a lot of attention..
http://clonezilla.org/

 

Thanks for the advice, I didn't realize Clonezilla did multicast. I tried following this tutorial http://oakdome.com/k5/tutorials/computer-cloning/free-computer-cloning.php but when I get to step 6 on the first page I just get "sudo: /opt/drbl/sbin/drbl4imp: command not found"

I'm not good with linux, though I think I should start being. Any help would be appreciated, or if you know of a easier way to get it working that would be appreciated.