I recently found a 4930K that actually was on the list here for sale on Ebay. 3326B652
Just gotta be lucky in finding them and when you see one don't hesitate.
Bear in mind though it is still a lottery even within batches. While mine did post at the reported volts here @ 4.5 it was no where near stable at that.
For now I have it stable at 4.6 @ 1.35v. Did 20minutes of P95 at 4.7 @ 1.45v before BSOD.
I am on H110i AIO. It is reported that it will do 5.6 on LN2 @ 1.6v I may get it to post at 5.0+ but will be no way stable under 1.55v.
Still happy with it though coming from a 4820K.
Good luck