You have one more option on used barrels that isn't widely known or mentioned much, IF the barrel underlug is long enough to be fitted, H&R will fit it if they can for $25, that's the same fitting fee and return shipping they charge for a new barrel. But, there's no guarantee that they can, if they can't, you'd be out the $10 return shipping, plus the cost to ship to them. A barrel that they'd likely be able to fit would be one that you can't get it close to being closed and locked up, if it's loose and locked up with a gap at the barrel and standing breech, they wouldn't be able to fit it at all.
Tim