The one I have, I got at the local Wal-Mart about 10 years ago, and paid about $20 for it.
Edit: I remember how I lost my Boker. I used to drive a '73 Pontiac Safariland station wagon, one of those great American cars that was the size of a coal barge. It had a distributor cap that was susceptible to moisture, and on foggy, damp days, moisture would get under it and the car wouldn't start. So I would have to remove the cap, and wipe the moisture off of the inside with a Kleenex or handkerchief, in order to start the car. This required a screwdriver, which I didn't usually have handy, so I used the sheepsfoot blade of my Boker as a screwdriver. One morning while doing this, I dropped the knife into the engine compartment, and it didn't fall out of the bottom. I looked all over for that thing and never did find it.