I did find a cheap Core i5 8400 on Ebay but since I have a mini-ITX system,once I looked at the utterly ripoff prices for the Z370 mini-ITX motherboards I shelved the idea. The cheapest Z370 based mini-ITX motherboard is like £130 so that means the better locked B360 ones are probably going to be going close to that price at the top level.
Plus,now it seems the Z390 based motherboards are starting to be spotted:
https://videocardz.com/73974/first-intel-z390-motherboard-spottedI think I will have to delay my platform upgrade another year at this rate(unless my current setup has issues) - its no point if the CPU is good value if companies whack you with motherboard and RAM costs instead,and try to recoup costs elsewhere. IIRC,this has been done before,ie,cheaper CPUs but things like motherboards actually cost more than they should have.
Edit!!
Just realised I have been on my IB Core i7 for close to 4 years(and been on socket 1155 just after the B3 chipsets were launched). I don't think I have ever had a CPU that long IIRC!