Here's a quick overview of the current pricing:
Newegg currently lists the Core i5-9600K at USD $249.99, and the Core i7-8700K at $369.99, while the i7-8700 goes for $319.99, matched with AMD's Ryzen 7 2700X. The Core i5-8600K is listed at $239.99, which is just $20 above the consumer-favorite i5-8400. Newegg's pricing is still riddled with mark-up anomalies for SKUs in high demand. The Core i7-9700K is listed at $487.99, which is about $10 cheaper than Intel's MSRP for the Core i9-9900K, which is selling for an obnoxious $850.