Your first 5 output files and up to 50 pages are free. You pay $3 for the up to 100 template pages, and $1.00 for every additional 100 pages.
less than 5 output files
for up to 100 pages
for each additional 100 pages
The total number of template pages is the number of pages in the template file times the number of rows of merge data. As an example, if there are 3 pages in the merge template document and 20 rows in the merge data sheet then there are 60 template pages.