I don't think they expect anyone to actually buy these.
Most companies looking to buy these for developers would ideally have multiple people share one machine and that sort of an arrangement works much more naturally with a managed cloud machine instead of the tower format presented here.
Confirming my hypothesis, this category of devices more or less absent in the used market. The only DGX workstation on ebay has a GPU from 2017, several generations ago.
If you try to find the pricing of the GB300 towers even on the manufacturer sites, you'll see that it's not listed for any of the six or so models.
The MSI workstation is the one that is showing some pricing around. Seems like some distributors are quoting USD96K, and have a wait time of 4 to 6 weeks [0]. Other say 90K and also out of stock [1]
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0: https://www.cdw.com/product/msi-nvidia-gb300-wkstn-72c-grace-cpu/9087313?pfm=srh
1: https://www.centralcomputer.com/msi-ct60-s8060-nvidia-dgx-station-cpu-memory-up-to-496gb-lpddr5x-nvidia-blackwell-ultra-gpu-1x-10-gbe-2x-400-gbe.htmlOlder xeon based workstations easily reach that number.
"Purchasing limit reached. To complete your order and provide you with the best customer experience, please call 1-877-888-8235"
Since the user here is not paying for it directly, the manufacturer does not have any incentive to list prices anywhere.