c9g.xlarge is an AWS EC2 instance with 4 vCPUs, 8 GiB memory (AWS Graviton5 Processor). In US East (N. Virginia) it costs $0.1739 per hour on demand ($126.95 per month) for Linux. Spot capacity is about $0.0775 per hour. It is sold in 8 regions; the cheapest is Asia Pacific (Malaysia) at $0.1698 per hour.
Prices by region
USD per hour, Linux. Reserved prices are no upfront, standard. Cheapest on-demand first.