Browse the H&R classifieds to find what they've sold for in the past, seems to me real nice ones go for $150-$200, Larry picked up a couple for half that if IIRC. If they have wide firing pins, they're ML only and can't be fitted with shotgun barrels due to the opening in the frame being too small for the underlug, so they can be shipped without an FFL involvement, same for the Rem 700ML, it's a ML only.
Tim