The other day while I was up in Lake Hughes, I stopped by my old landlord's place and bought his "alaskan mill" setup.
Which, incidentally, came with a near-new Stihl rollomatic ES sprocket tipped, 3/8, 28" bar... So it looks like I won't be needing to go out and buy one
The length rod on the mill measures 30", and with the extra 4" or so on the tip clamp guard, I'm pretty sure it'd take a 32" bar with no problem.