getting/making a tuner

I have a rio car that I bought many years ago. It's never actually made it into a car since I didn't get an FM module with it.

What might I ahve to do to find/make an fm tuner module at this point?

and I suppose i could just go read the faq after the fact that says that I need to hit the bbs or ebay.

A 'wanted' post in the For Sale section would be your best bet at this time.