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Apologies if someone else has already mentioned this, but I recently bought some cheap K band LNBs which have turned out to be PLL types (*3566E chip using a 25 MHz reference). The price is currently £2.36 each (no extra postage) from AliExpress:
https://www.aliexpress.com/item/3305148 ... _edm_other
Seems to work as well as any other that I have, but be warned or pleased that the LNB is encapsulated in a one piece plastic housing which will be destroyed if you try to gain access. I have pics, if necessary.