There's a Savage lefty short action in 260 in the local shop right now. The only one I've ever seen, frankly. At $350, I'm eyeing it covetously.
I chased Rem 700 lefty short actions for years and found several. I did most of the things I wanted to try with 'em and concluded that most of what I wanted to do I could do just fine with the more-available long action.
For instance, my across-the-course match gun is (was) a long action in .308. The short rounds fed just fine from the back of the long mag and the long action allowed five in the mag. The shorty won't.
The 6mm Rem project on a shorty showed me that intermediate length rounds belong in a long action. The 6mm barrel off that one is now on the gun mentioned above.
I kept an as-issued .22-250 VS and one other short action BDL that's been several different calibers by now, but that's it. A 700 .223 lefty would fill a niche but other'n that, there's no real advantage to the shorty action, IMO.
A long and windy two cents worth,
Redial