db.m2.4xlarge is an AWS RDS size with 8 vCPUs, 68.4 GiB memory (Intel Xeon Family). In US East (N. Virginia) it costs $1.39 per hour on demand ($1,014.70 per month) for PostgreSQL, Single-AZ. It is sold in 9 regions.
Prices by region
USD per hour, PostgreSQL, Single-AZ. Reserved prices are no upfront, standard. Cheapest on-demand first.