We don't I'm afraid, they just didn't sell well enough, MTB bikes are largely a fashionable thing, at the end of the day we just ain't fashionable when it comes to MTB's so we leave it to the likes of Cannondale, Specialized, Marin, Trek etc
We have a few small Sterling frames left and as Dan correctly points out a Nomad X makes a good roughstuff ATB/Tourer with a sus fork.
Hope this helps, keep that Catalyst in good nick