See also its Nvidia equivalent https://www.supermicro.com/en/products/system/gpu/8u/as-8125... which is implicitly on allocation because TSMC has been contracted to make only so many H100 chips per unit of time, I think I heard 550,000 for 2023. I remember seeing that the Nvidia cards list at around $30K each....
I think the store is more for stuff that's in more plentiful supply and less ITAR restricted, with a limited number of SKUs and options for each that they're prepared to support for a long time.