In June I contacted Ruger and talked to them about replacing the original 5 1/2 in barrel on a stainless steel Super Backhawk with a 4 5/8 in barrel. They told me the price would be $155, including return shipping. I sent them the gun, a check for $155, and about 6 weeks later got it back with a 4 5/8 inch barrel installed. The original 5 1/2 inch barrel was also returned to me.
In addition, the gun I sent them was purchased 2nd hand, was well used and appeared pretty decrepit looking. When I got it back it had been rebuilt and looked new. The rebuild was not discussed as part of the $155 I paid, its just something they chose to do. If you call them, they will tell you what they will do, how much it will cost, and break down the cost for you so you know what you are paying for.