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.html