db.x2gd.large is an Amazon Neptune size with 2 vCPUs, 32 GiB memory (AWS Graviton2). In US East (N. Virginia) it costs $0.738 per hour on demand ($538.74 per month) for I/O-Optimized storage. It is sold in 3 regions.
Prices by region
USD per hour, I/O-Optimized storage. Reserved prices are no upfront, standard. Cheapest on-demand first.