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The $700 PS5 Pro doesn’t come with a disc drive
(www.theverge.com)
This is a most excellent place for technology news and articles.
I doubt it costs that much. You're looking at it from buying PC components perspective. But they are mass producing identical boards with components that are 4+ years old by now, except the GPU. The cost of production is probably around the same as it was for non-Pro when it was released.