Can anyone tell me where can I buy an alternator connector for a 1998 dodge neon?

 

If you are referring to the wiring harness ends, then your best bet would be to go to your local junkyard and either get the whole rear harness, or just cut off the connectors you need from one in the lot.

I would imagine that the dealership may have those connectors, but most likely they have made those parts obsolete and no longer carry them as they have so many other 1st gen Neon parts.