Hard to tell from the tiny pic, but if that's the lowend Maverick, here's NOS for $199
http://www.rscycle.com/2008-Iron-Hor...-Cross-Country

Ahh, no disc there. That red one's probably mid-range.

I'm still scared. The Maverick 3.0 has Promax brakes. My Trek 4000 has Promax Vees - chintzy!

I think you're better off running midrange V-Brakes than low-end disc. And those forks, yuck. Rigid forks are usually better than cheep sproing.