HOn3 K-27's

Once again, I'm in need of help for my model railroad. I have finally gotten all but one of my engines(I just got an old(50s?) Kemtron kit for a C-16, and will be cutting it up for parts. Anyway, I have been looking for two years for a pair of K-27's, one inside admission cylinders, and one outside. I got the inside one, but have not seen any outside ones for sale. I am willing to take any K-27 that runs well, has little to no tarnish, and is inside or outside admission. I have been keeping my eyes on at Caboose hobbies, the whistle stop, and peach creek shops. Anybody know anywhere else I can get one? Any leads would be extremely appreciated.
Thank you.