i4g.large.search is an AWS OpenSearch size with 2 vCPUs, 16 GiB memory. In US East (N. Virginia) it costs $0.247 per hour on demand ($180.31 per month); a 1-year reserved instance with no upfront costs $0.17 per hour, 31% less. It is sold in 8 regions.
Prices by region
USD per hour. Reserved prices are no upfront, standard. Cheapest on-demand first.