db.m9g.8xlarge is an AWS RDS size with 32 vCPUs, 128 GiB memory. In US East (N. Virginia) it costs $2.93 per hour on demand ($2,138.90 per month) for PostgreSQL, Single-AZ; a 1-year Database Savings Plan costs $2.344 per hour, 20% less. It is sold in 4 regions.
Prices by region
USD per hour, PostgreSQL, Single-AZ. Reserved prices are no upfront, standard. Cheapest on-demand first.