AWS offers scalable cloud computing services.
UTS eResearch is presently looking into using AWS nodes as burst capacity for HPC and ArcLab when both of those are busy and expecting delays in processing jobs. AWS may also prove handy should different computing environments to the HPC be required. Drop us a line if you're interested in an account.
AWS offer a grant scheme which you can talk to the eResearch team about. More details can be found here.
Note: This is not a free service.