db.x2iedn.2xlarge is an Amazon Neptune size with 8 vCPUs, 256 GiB memory (Intel Xeon Family). In US East (N. Virginia) it costs $4.52 per hour on demand ($3,299.60 per month) for Standard storage. It is sold in 9 regions.
Prices by region
USD per hour, Standard storage. Reserved prices are no upfront, standard. Cheapest on-demand first.