Spot instances on Amazon Elastic Compute Cloud (EC2) allow researchers to do high performance computing at very low cost. For example, a 64-core workstation with 256 GB of memory can be rented at about $0.7 per hour, which is ~80% off regular on-demand prices. You can request 10 of such servers and use them for 5 days and 2 hours and it only cost you a few hundred dollars.These are spare computing capacities that could be abruptly terminated.