I would certainly add Mr. Ralph Shatuck to the list of reputable dealers. I bought a K date from him several years back and it was not only a fair price but exactly as he represented it. He's a no frills guy (no fancy web site or pictures), but if you e mail him what you want, he'll get back w/what he has available.
Semper Fi and good luck. But be careful, these things rapidly become an addiction!