I believe you're allowed to install your App Store Lion on more than one Mac, so if you've got another one, you can d/l the installer again and save the pertinent section; do a Google search for "extract lion installer" beforehand, so you'll know exactly what to do.
The installer can be saved before you run it, but, as tacit has mentioned, it "disappears after it does its job."
Edit: Harv has indicated that you don't need another Mac, so just go with the Google search and follow instructions.
Edited by artie505 (07/07/12 02:50 PM)
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In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire