Where do i get the OS X Yosemite installer?

[Thedarkbobman]

I have the original OS X Lion installer from a while back, but i don't seem to have the Yosemite one. I am also running Yosemite and can't find a way to get the installer. When i try and create a new unibeast bootable drive, i can only create one for lion. Where do i get the installer for Yosemite?

 

[madiera]

Download from the app store. All the operating systems are there now.