68 318 electronic ignition distributor

I have a 68 Dart 318 that has 25 degrees of slop in the distributor and I need a new one. I don't think it is original to the car since it now has electronic ignition on it. Are they expensive to buy new and can you get a good, new one? What about getting it rebuilt? Perhaps someone has one for sale out there. Let me know via PM. Thanks!