New Intel Z490 motherboards which have the LGA1200 socket required to be compatible with the supposedly soon to launch Comet Lake 10th-gen desktop processors will be considerably pricier than existing Z390 boards for current 9th-gen models, if some leaked prices are to be believed.

Now, we should make it clear upfront that this is just speculation based on early pricing drawn from a Ukrainian retailer (ITbox), so far from a major retail outlet, and this is to be treated with more than the usual sprinkling of condiments (think handfuls instead).
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https://www.techradar.com/news/intel-comet-lake-motherboard-prices-could-be-hiked-making-it-trickier-to-compete-with-amd