cache.c7gn.xlarge is an AWS ElastiCache size with 4 vCPUs, 6.38 GiB memory. In US East (N. Virginia) it costs $0.509 per hour on demand ($371.57 per month) for Redis; a 1-year reserved instance with no upfront costs $0.346 per hour, 32% less. It is sold in 4 regions.
Prices by region
USD per hour, Redis. Reserved prices are no upfront, standard. Cheapest on-demand first.