MidwayUSA has new, unfluted 629 cylinders for $112. It will work with some degree of fitting, etc., but nothing that a good 'smith can't handle. The biggest caution is that it may require setting the barrel back a thread if you are wanting a tiny cylinder gap. Usually they run average to upper acceptable limit.
The new ones also have the "modern" throat diameter, which is good if you shoot cast bullets.
I very much like my 10 5/8" 29s! I shoot them, Standing, IHMSA style, on both the short Field Pistol and the long BIg Bore courses. (100 yds max. vs. 200m.) I'm 62 and don't find them muzzle heavy or unwieldy. Great iron sight deer gun for deer with a little paint dot or three on the sights. But I limit deer distance to generally under 75 yards to ensure good hits in the vitals. "Easy", when you're used to smaller targets, further!