Hi, how do I create a standalone installer for Mountain Lion, ie, download once and then no more broadband required, thanks?

Hi, how do I create a standalone installer for Mountain Lion, ie, download once and then no more broadband required, thanks?
Context is that my other computers are not mobile and I do not have broadband worth troubling for a 4GB download - so will go to Apple Store with MacBook Pro for first download.

The easiest way is to download the installer but do not open it.
Next, make a copy of it and store it where it won't get lost.
Then take one of the copies and place into the applications directory and open it to begin the installer.
This has saved me the trouble of ever having to download the installer twice, plus you can mess around with the installer and try different options without having to worry about not having a clean install file if needed.
Best wishes

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