db.r5b.2xlarge.tpc1.mem2x is an AWS RDS size with 8 vCPUs, 128 GiB memory (Intel Xeon Platinum 8000 series). In US East (N. Virginia) it costs $2.205 per hour on demand ($1,609.65 per month) for Oracle Enterprise BYOL, Single-AZ. It is sold in 14 regions.
Prices by region
USD per hour, Oracle Enterprise BYOL, Single-AZ. Reserved prices are no upfront, standard. Cheapest on-demand first.