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This kind of processors are sold to system manufacturers (such as HP) to build their systems, normally, they are not available to end customers, this is why they are hard to find.
In addition, if you plan to upgrade the processor of your laptop, I would recommend contacting the manufacturer to see if the processor you want is compatible with the computer, this because there are some other specifications (besides the socket) that you have to consider such as BIOS compatibility, electrical limitations, OEM restrictions, among others).
Nevertheless, I found a place where you can find this processor:
You can also check this article for further information (it also applies to mobile processors)
I hope this information helps.