It would be best if you find one to take someone that has some knowledge about revolvers. Not someone that just thinks they do!
Some pointers are:
If you find on be sure the cylinder locks up and the revolver is in time! How you do that is pull the hammer back all the way then holding the hammer pull the trigger all the way to the rear and let the hammer down gently. When the hammer is all the way down, then in each of the six positions make sure the Cylinder locks up good and solid in all 6 positions.
Also make sure the Crane in front of the Cylinder and Cylinder do not have a lot of slop in them from wear.
Be sure the Rod used to eject the casings from the cylinder pushes smooth and straight and is not bent or warped. and the Cylinder spins freely on it.
If you take someone who knows this you should be in good hands.
Good luck! If you would get one online get a written agreement that it can be returned if the revolvers condition is not what they say it is! Yes I said in writing! or Email whatever. If you buy it out of state you will need to go through an FFL Dealer! Some states may require it anyway? If you live in Indiana and buy it from an individual in Indiana you do not have to do that. Also is there any chance you might inherit the gun from your uncle or does he have children he is passing it down to?
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves.