Update: This deal has expired. Please see our best Cyber Monday CPU deals for the latest processor savings.
We're in the middle of a huge shortage of new Ryzen 5000 series processors, but Intel's 14nm Comet Lake chips can now be found at surprisingly good pricing for Cyber Monday, like this Core i5-10400 that now retails for $149.99 at Amazon. That's $30 off its normal list price, and the lowest price we've ever seen for this processor.
For $150 you get six cores and 12 threads that operate at a 2.9 GHz base and 4.3 GHz boost frequency. That's complemented with 12MB of L3 cache and support for DDR4-2666 (Intel cuts back the memory frequency on its lower-end Core i5 models). The 65W chip comes with a stock cooler that should be sufficient for stock operation (the chip isn't overclockable), which helps if you're focused on a budget build.
Intel six-core 12-thread Core i5-10400: was $180, now $150 at Amazon
This six-core twelve-thread processor has a 2.9 GHz base and 4.3 GHz boost frequency, making it a solid deal for Intel fans at only $150.
AMD's capable Ryzen 3 3300X is the best alternative to this processor in this price range, but that processor can't be found at retail - it's been a ghost for several months. That leaves the Core i5-10400 some room to operate, and it's a solid deal at this adjusted price point. You'll need a socket 1200 motherboard to support the chip, but there are a few great deals on Comet Lake-compatible motherboards floating around for Cyber Monday. Be sure to check our Best Cyber Monday Tech and PC Hardware hub for the best deals.
For more savings, check our list of best Cyber Monday monitor deals, best Cyber Monday SSD deals, best Cyber Monday CPU deals, best Cyber Monday graphics card deals, best Cyber Monday laptop deals, best Cyber Monday gaming PC deals and best Cyber Monday Raspberry Pi deals.