I remember such a topic. Did a quick search and here's what I found. Look over the suggestions given by the members here. Maybe you'll find something you can use.
http://www.talkgraphics.com/showthread.php?t=4206
Also, did a quick google search and found this:
http://shareup.com/Print_Merge_Numer...load-8412.html
I haven't downloaded this or tested it, so no guarantee that this is really free or anything, so you try it at your own risk...
But I think there are some pretty sound suggestions given in the forum topic link...