Raptor Computing provides POWER9 workstations. They're not cheap, still use last-gen hardware (DDR4/PCIe 4 ... and POWER9 itself) but they're out there.
Raptor's value proposition is a 100% free and open platform, from the firmware and up, but, if they were willing to compromise on that, they'd be able to launch a POWER10 box.
Not sure it'd competitive in price with other workstation class machines. I don't know how expensive IBM's S1012 desk side is, but with only 64 threads, it'd be a meh workstation.
IBM should see some entry-level products as loss leaders.