Deconstructing a Binder deployment can be a little bit confusing because users may have caused new cloud containers to be created. It is important to remember to delete each of these containers or else they will continue to exist (and cost money!).
If you would like to shrink the size of your cluster, refer to the Expanding and contracting the size of your cluster section of the Zero to JupyterHub documentation. Resizing the cluster to zero nodes could be used if you wish to temporarily reduce the cluster (and save costs) without deleting the cluster.
To delete a Binder cluster, follow the instructions in the Turning Off JupyterHub and Computational Resources section of the Zero to JupyterHub documentation.
Important
Double check your cloud provider account to make sure all resources have been deleted as expected. Double checking is a good practice and will help prevent unwanted charges.