Looking for a k-mount 200-300mm lens

My good friend Dale recently purchased an old farm house on Grand Manan Island in the Bay of Fundy
(eastern Canada).Man,what a view.Lots of whales and dolphins right off the beach.
I had set him up with a nice Pentax 50mm & a 135 but he really needs a piece of glass with greater focal length.Maybe a 200-300mm.
Does any member have a sutable lens for sale? Just drop me a line and I'll get in touch with Dale.

Thanks Much

Vivitar Zoom Telephoto 75-300mm f/4.5-5.6 Manual Focus Lens for Pentax PK and
Vivitar 2X Manual Focus Teleconverter for Pentax K
or
Kenko X MC4 (Multi-Coated, 4-Element) Manual Focus Teleconverter for Pentax K(A)