*** High Sierra is now hidden on the Mac App Store. It is still available, but it's hard to find. To find it, check out this video:
Find High Sierra on App Store

This video shows you how to create a bootable USB Flash Drive Mac OS X Installer. You will be able to boot most Macs from it and then install Mac OS X 10.13 High Sierra without needing to redownload the installer for each Mac. You can also use it to format the internal drive of a Mac using the built in Disk Utility, this is also covered in the video.

You will need a 16GB or larger USB Flash Drive (aka USB key). Make sure it's empty, because you'll be deleting everything on it during the process of making the installer.

If you have a problem downloading the full installer and you only get a 19MB file instead of the full 5GB installer, check out this article to show you how to work around that problem:
http://osxdaily.com/2017/09/27/downlo...

You will use a command in the Terminal. It is best to copy and paste it from here, just make sure you name your USB Flash Drive “MacInstall” (without the quotes). If you type it, make sure you type it correctly, or you will get an "unknown command" error. Here is the command for your reference:

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia volume /Volumes/MacInstaller applicationpath /Applications/Install\ macOS\ High\ Sierra.app nointeraction &&say Done

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