Non-ES info but I've noticed recently market had price adjustment (or new-obsolete stock release) for SPR 8473C (for Microsoft) and 8487C (not sure to whom those were intended for - AWS, GCP, AliBaba, IBM, etc.) at some ok-ish prices, I think both models are designed for multi-socket configurations (UPIs unlocked),
None of sellers on ebay are first-hand owning it - therefore they're only resellers (and just charge some margin on input price), so don't expect material discounts (I think around 5% max), which probably still makes those CPUs a bit overpriced (subject to how much value you can extract for your use-scenarios of course), at these prices I would get those 3-4 years ago (and was actually submitting offers in this range) but not now anymore.