I can't help with the bike, but just to flag up that the early Charge Cooker Maxi fat bike, in steel, had the same 135mm /135mm hub arrangement as the Pugsley and you may find one of these more easily than the Surly, and for much less money. I sold mine a while back: excellent bike. I have x4 fat bikes now, but have fond memories of the Charge...
Good luck in your search.