You Mac users probably know about this already, but in case you didn't, go here: http://www.macheist.com/ There's a bunch of software that they normally charge for, only it's freeeeeee for the next few days. No idea what's there - I'm not a Mac guy - but hey, maybe you are. Enjoy!
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This is a sample I used in some VBA code embedded in an Excel spreadsheet. This line checked if the cell value was blank. You could use the line in an "If-then" setup to set the .value parameter to the random number. Sheet#.Cells(X, Y).