There is an online site which gives best deal for PC components at the time of writing, www.primeabgb.com.
Current price of Core i3 at amazon.in,
In this site, every component is 1-2K INR less compared to any other online store. 5-10K can be easily saved for an entire PC build for the same components elsewhere.
My new CPU and RAM arrived recently, well packed and tracked, through FedEx from primeabgb. I have bought a Core i3 8100 because it is the most suited to pair with an existing GTX 1050 Ti and with 8th generation, it has 4 cores with 6MB cache. The CPU and RAM arrived in 3 days, but Z370 motherboard is yet to be delivered. But, I like this site, they have enough options to choose from and the prices are decent.
update: Motherdoard arrived after a week. Installed and the system is up and running
Z370 HD3P from Gigabyte supports 8th gen Intel processors with max 64GB DDR4 Dual channel memory, 2 x M.2/NVMe, 2 x PCIex16, 3 x PCIex1, 1 x PCI and 6 x SATAIII slots for expansion.