I've seen them loose, and usually beat up, but never new in the box. $20 was a great deal with that NIB.
I've been wanting to pick one of the old Camillus or Ulster with Phillips up to try as an EDC item. The Ulsters, however, use a cut down Phillips bit that's peened onto another piece. They're far weaker than what Camillus did. I have yet to find a reasonably priced SAK or Adler Schrade at a flea market. Yesterday, a guy wanted $15 for a beat up Adler/Schrade Classic-alike at an indoor flea market. The bright side is the same guy had an NIB Boker Great American Story Moose for $25, less than half what they are on Ebay.