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For those who's interested: US$388 + shipping from Japan
AS-IS TAMRON SP 300mm F2.8 LD 60B Pentax K Mount Telephoto Lens from Japan | eBay OPTIC/GLASS There are some dust specks and slight scratches inside the lens.
There is a insect garbage on the middle element, which might affect image quality or resolution.
There are faint fungus on the edge of the front element, which is being visible under the strong light and will have no affect on the image quality.
It seemed to have no affect on the image quality at least in general use. (It could do against the sun or string lights).