CL,
If you don't go with the barrels listed above then I would check out cabelas. I got a decent deal on a rifled barrel with cantilever on there. That was around $189 without tax, so around $200 with a cantilever is normal. You might be able to find one for less if you don't want one with a cantilever barrel. Check out some gun shops as well. I know of a gun shop near me that has used barrels. Good luck.