a1.2xlarge is an AWS EC2 instance with 8 vCPUs, 16 GiB memory (AWS Graviton Processor). In US East (N. Virginia) it costs $0.204 per hour on demand ($148.92 per month) for Linux; a 1-year reserved instance with no upfront costs $0.1285 per hour, 37% less. Spot capacity is about $0.1909 per hour. It is sold in 9 regions; the cheapest is Asia Pacific (Mumbai) at $0.204 per hour.
Prices by region
USD per hour, Linux. Reserved prices are no upfront, standard. Cheapest on-demand first.