I bought a new hand for my Uberti Remington from Kranks about 10 years ago.
It was under a tenner back then.
I think Peter Dyson, who is an extremely talented Gunsmith probably has them too, as the Uberti spares will fit an original Remington or Colt.
He's based in Holmfirth, Yorkshire. Tel 01484 661062.
HTH
Ben