db.m1.small is an AWS RDS size with 1 vCPU, 1.7 GiB memory (Intel Xeon Family). In US East (N. Virginia) it costs $0.06 per hour on demand ($43.80 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.