Despite the massive price cut, the FX-9590 still costs $50 more than the faster Core i7-4770K.
So, what about now? Funny story. The FX-9590 is down to $350 at Newegg. That's for the bare chip, but there's also a full retail kit for $390. The kit comes with an all-in-one water cooler, so it's a pretty good deal, relatively speaking.
The slightly slower FX-9370 has also made its way into a retail package. That chip peaks at 4.7GHz but has the same 220W TDP as the FX-9590. You can grab it with what appears to be an identical liquid cooler for $290. AMD's previous top-of-the-line CPU, the FX-8350, still sells for $200.