Starting from March 28th 2021, you can purchase up to 20 accounts per data source with Supermetrics for Data Studio & Google Sheets in Supermetrics website for most data sources that aren't marked as "premium".
The definition of "account" varies by data source. Below is a list of data sources with account definitions:
Note: This account limitation is not applicable to the following data sources:
Facebook Public Data
Google Big Query
Instagram Public Data
Pinterest Public Data
Reddit Public Data
Tumblr Public Data
Twitter Public Data
VKontakte Public Data
Vimeo Public Data
For more than 20 accounts per data source, you must contact sales for a custom number of accounts.
For premium connectors, you must contact sales for a custom number of accounts.