There are quite a few locations where that software version can be purchased online..

And did you make a backup copy of the Publisher 2002 CD? Some of the EULA's for Office products allow the user/purchaser to make a backup copy for use in such circumstances. It may be too late now but you can check your Publisher EULA to verify if that's appropriate. (Open Publisher, click on "Help" in the upper left corner, choose "About Microsoft Office Publisher", then click on the blue "View End User License Agreement" link..

Hope this helps.