There is no exact cloud equivalent - the researchers used commodity hardware for their GPU, something that NVIDIA doesn't allow for use in data centres.
The closest you can get on AWS (more like System #3 in the paper with 4x GPUs) would be something like a p3.8xlarge instance [1] that'll cost you $12.24 (on demand) or $3.65 to $5 (spot price, region dependent) [2].
A single GPU instance (p3.2xlarge) only 16 vCores, though) will cost you $3.06 on-demand or $0.90 to $1.20 (spot).
The closest you can get on AWS (more like System #3 in the paper with 4x GPUs) would be something like a p3.8xlarge instance [1] that'll cost you $12.24 (on demand) or $3.65 to $5 (spot price, region dependent) [2].
A single GPU instance (p3.2xlarge) only 16 vCores, though) will cost you $3.06 on-demand or $0.90 to $1.20 (spot).
[1] https://aws.amazon.com/ec2/instance-types/p3/ [2] https://www.aws4less.com/AWS/AWSCurrentSpotPrice.php