I signed up with PWCC Vault awhile ago. You have to be a qualified buyer before they let you bid on items.
https://www.pwccmarketplace.com/


Now I'm reading eBay is opening up their own Vault.
https://pages.ebay.com/vault/


I do know they had it out when eBay accused PWCC on shill bidding.
PWCC is no longer on eBay that I'm aware of.