c4.4xlarge.search is an AWS OpenSearch size with 16 vCPUs, 30 GiB memory. In US East (N. Virginia) it costs $1.174 per hour on demand ($857.02 per month); a 1-year reserved instance with no upfront costs $0.81 per hour, 31% less. It is sold in 15 regions.
Prices by region
USD per hour. Reserved prices are no upfront, standard. Cheapest on-demand first.