It looks like Intel will be trying to clear out their inventory of 9th generation Core X HEDT processors based on the “Skylake-X” silicon. They will be cutting prices of these processors by 50%, just in time for the new Cascade Lake-X processor that will be launching soon. When Intel announced their 10th generation Core i9 “Cascade Lake-X” processors they came with reduced prices compared to the previous generation, so it makes sense for them to cut the prices of 9th generation chips in half.
With this move you should see 9th generation chips available for far less than the upcoming 10th generation siblings. Keep in mind that the single-thread performance (IPC) is identical between these generations. The only thing that has changed is that with “Cascade Lake-X” is the introduction of the DLBoost instruction-set that speeds up AI applications, and an improved Turbo Boost algorithm that spreads boost clocks across more cores, including Favored Cores capability that you’ll see in the Windows 10 2H19 update.
So if you are on an older Intel HEDT system it might be the right time to upgrade.