Depends how much you want to spend over the MRSP price.
Here 3rd party sellers at Amazon.com. Most cost around $2600.00 to purchase: https://www.amazon.com/AMD-Ryzen-Threadripper-3970X-64-Thread/dp/B0815JJQQ8
Also from Newegg: https://www.newegg.com/amd-ryzen-threadripper-2990wx/p/N82E16819113618
From BHPhoto but back ordered but cheaper: https://www.bhphotovideo.com/c/product/1516708-REG/amd_ryzen_threadripper_3970x_3_7.html
Finally from PCPARTPICKER shows 3 Retailers with 2 in-stock: https://pcpartpicker.com/product/rkwkcf/amd-threadripper-3970x-37-ghz-32-core-processor-100-10000001...
