IBM now sells version 6.1 for $65.25 on http://www-142.ibm.com/software/dre/ecatalog/detail.wss?locale=en_US&synkey=C106020Q39953T06
There might be shops somewhere that still have the older version. Or try eBay or comparable sites. Somehow I feel that nobody here is going to search for you.
Some years ago I loaded Lotus Organizer 5.0 on my desktop. I now want to load it on my laptop but do not have the program. How can I find that older program?