There is now a crimp tool available from Mindsensors. So you can buy the NXT jacks, and crimp your own cables (there are many materials available that make good cables).
They cost a bit more than regular crimpers, but hey... they aren't regular crimpers. These are for the NXT jacks! :)
Curses to Motocube.com for bringing these to my attentention... now I have to go buy some.