c9g.medium is an AWS EC2 instance with 1 vCPU, 2 GiB memory (AWS Graviton5 Processor). In US East (N. Virginia) it costs $0.0435 per hour on demand ($31.76 per month) for Linux. Spot capacity is about $0.0065 per hour. It is sold in 8 regions; the cheapest is Asia Pacific (Malaysia) at $0.0424 per hour.
Prices by region
USD per hour, Linux. Reserved prices are no upfront, standard. Cheapest on-demand first.