You can get the location of the script file with "the path to me". Then you just need to tell the Finder to duplicate it.
Code:
tell application "Finder"
repeat with i from 1 to 100
duplicate (the path to me)
delay 1
end repeat
end tell
That'll make 100 copies, pausing for 1 second between each copy.
(Note: If you run this in Script Editor, it might duplicate the Script Editor application. Save your file as an application and run it from the Finder for best results.)