ServeTheHome claims "HGX A100 platforms, when they are sold as single servers are generally in the $130K-$180K even leaving a very healthy margin for OEMs/ resellers"
https://www.servethehome.com/graphcore-celebrates-a-stunning...
Not sure about the H100, but it seems to be more supply constrained (hence pricier) atm.
Now, the real question is how many HGX nodes "equals" a single CS2 node. The math here is extremely fuzzy, as the benefit to such extreme node consolidation depends on the workload, and the CS-2 takes up less space, but the HGX cluster will have more directly accessible RAM and better turnkey support for stuff since its Nvidia.