The Tor Project has a dedicated page for setting up relays on EC2 instances: >The Tor Cloud images have been configured to use no more than 40 GB of bandwidth

The Tor Project has a dedicated page for setting up relays on EC2 instances: >The Tor Cloud images have been configured to use no more than 40 GB of bandwidth out per month. We have estimated that customers who do not qualify for the free usage tier will pay up to $20 a month for an instance located in us-east-1 (Virginia). >Customers who qualify for the free usage tier, but who run bridges that use more than 15 GB of bandwidth out per month, will pay up to $3 per month for an instance located in us-east-1 (Virginia). https://cloud.torproject.org/ https://cloud.torproject.org/