We have a treat for ITX builders, the ROG STRIX Z370I from ASUS.
This motherboard is almost identical to Z270I. The author of the photographs was already able to buy the motherboard in Vietnam (the concept of sale embargo does not exist there).
The CPU he used is Core i7-8600K with Confidential markings, which means the CPU was one way or the other sourced from Intel.
At ShopBLT you can find the pricing of all Z370 motherboards from ASUS. The most expensive model called MAXIMUS X APEX will require a 328 USD investment.