db.r6gd.8xlarge is an Amazon Neptune size with 32 vCPUs, 256 GiB memory (AWS Graviton2). In US East (N. Virginia) it costs $8.152 per hour on demand ($5,950.96 per month) for I/O-Optimized storage. It is sold in 8 regions; the cheapest is US West (N. California) at $6.664 per hour.
Prices by region
USD per hour, I/O-Optimized storage. Reserved prices are no upfront, standard. Cheapest on-demand first.