CD changer adapter?

[fierodough]

I have a Pioneer double din in my Escalade, I would like to reuse my stock CD changer. I know there is an adapter to use a Pioneer changer on an AC Delco radio, but is there an adapter to connect my stock changer to my aftermarket head unit?

If not. *SIGH* can someone recommend a single din device I can stick in there under $200 and that preferably works on ip-bus to connect to my head unit?

Thanks!