Go to www.embird.net, click on purchase and it will state the different module prices. It all depends what it is you want to have. Also you can add them separately. No reason to have to purchase them all at once.
About BestBuzz. Here is the website with the different options and prices. www.buzztools.com
Also if your were to put this question in the category "Digitizing" you may get more results. Also let any one know if you read the answers and if solutions were found. Hope this helps.
I have used Buzz Explore for years and love it. Inexpensive and does what I need to view a library and change from one sewing version to another for different machines.