I get it, but as "professional" grade equipment, most customers would acquire that through their employers' vendors.
It also depends on your local market; my location seems to carry more server and HEDT gear than others (they stock more A- and W-series GPUs than 5090s, at least). They've also purchased things I've requested, like ECC DRAM for my Threadripper, which I also purchased from them.
I wouldn't be surprised, most retailers can place special orders for things they don't have in stock. I do this at my local record store, book store, and comic store with some frequency.
It also depends on your local market; my location seems to carry more server and HEDT gear than others (they stock more A- and W-series GPUs than 5090s, at least). They've also purchased things I've requested, like ECC DRAM for my Threadripper, which I also purchased from them.