Hard to say. I think it's the Gerber Paul knife, Final Production Run. The last time I saw one for sale was at AG Russell's Cutting Edge and the price was $425 as I recall. I paid $175 for it a few years ago, so it's also one of the most expensive knives I've bought.
This year I bought two early customs from Don Hanson III that cost $150 and $125. I have no idea how much they'd sell for at a custom knife shop, but I bet it would be considerably more than I paid.
-Bob