@lkind - I use this report (https://go.servicetitan.com/#/new/reports/1587) and export it into Excel - then highlight all non-numerical groups to count it. At the bottom left, the Excel software will total the lines you have. If you need to granularize the data, you can with the filter function at the top line. This is what I use to count specific memberships or total.
Hope this helps. Stay inspired and stay in touch! ~ Josh
I like to use the general Customer List report and then filter for the auto-generated tag attached to the membership itself. If that doesn't help, you can also run an invoice report for all clients who were billed (successfully or not) and filter by the exact price.