I just received an email on a Black Friday Special concerning that same processor you are asking for: Ryzen 9 3950X from Newegg.com: AMD Ryzen 9 3950X 3.5 GHz Socket AM4 100-100000051WOF Desktop Processor - Newegg.com
This is the email I received but deleted but was able to make a copy from from online Email trash folder. This is the link to that processor but it also mentions it is sold out: Forged from the Finest Silicon | Newegg.com
Maybe you can Pre-Order this processor at Newegg.com.
EDIT: According to several websites the Ryze 9 3950X will be available for purchase on November 25, 2019.
