Right now the market is very tight so you are not seeing nearly as many coming up for sale. They are out there that's for sure. BladeForums rocks but you have to broaden your scope to see more.
I have known and met SEALs and SF Divers. Many have got a very different perspective regarding knives than we do. Its knida like this: We get what we need and use it...nuff said.
Most of these guys are way more interested in delivery systems, commo gear, firearms and ordinance than knives.
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Usual Suspect