Are you a Dominican or just a resident?
I only know about renewing my residence Cedula in Santo Dominigo.
One thing I learned is that if it expires in 2007, then you can not renew it until at least January, 2008. I had that problem when mine expired in 2005, they told me to come back in 2006 to renew it. They have some very strange rules here in the DR.
They just recently started charging for cedulas, perhaps a search will turn up the thread about it, I don't remember the prices.
Don ♥ SantiagoDR