Check out eBay listings for a genuine replacement.
And don't give up on your knife! I once lost the Schrade stockman that I've had since high school in a local lake. Two years later, I got my SCUBA certification. Later on, I found myself diving in the same location where I lost the knife. I surfaced to get reference and started searching. I found it!!! What are the odds?
It looked pretty bad but cleaned up very well. The blades are now very dark in color and the one that was open has a weird pattern on it that looks sort of like Damascus.
If you're bent on a new Benchmade to replace it, I'd recommend the 710 D2 or the 943, both Axis locks. The 943 has a blade shape similar to the AFCK.
Good luck,
desmobob