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Why is it so difficult to find C28x?

I am concerned about the lack of the C28x chips on the distributors like Mouser, Digikey, Newark, etc. There is not  even older part numbers like the F280x and F2833x. Other manufacturers of DSC has all the part numbers in stock at all distributors.  
This situation must change or F28x will always be hard to find? Accessible only for big players.