They said it should be around $299 for the custom application and no more than $349. It's a bit expensive considering the parts that come with the kit - just a few blocks with holes drilled in them and some springs. I think it's still worth it since people swear this stuff works well. Especially when most other disk/clutch type lockers cost around $1000 or more.
I'm gonna pull the diff out and send it in next week and will post my impressions about it. I am not expecting as much difference from this as most 2wd cars get. It definitely would help AutoX and make a center diff mod a sensible upgrade.