Hi Mitch,
I am glad you asked. I have had the same problem, lots of bad speakers and no replacements. Reconing costs $35, and doesn't seem worth it for a small speaker.
I considered trying to learn how to rcone speakers myself. Parts are available from http://www.mwaspeakerparts.com/. However, you need to convince them that you are serious about reconing speakers and know what you are doing before they sell.
I found a source for 4 ohm 4 inch speakers but the speakers did not have good sound quality.
Best regards,
Bill Grimm