Where to get CD changer adapter?

I am posting this for my brother, hoping you guys can help:

My brother owns a 98 Dodge dakota and just bought a kenwood CD changer since he wants to keep the stock stereo in there. Well we need to now find a adapter for it and so far the cheepest place was crutchfeild ($100). I think the part # we need is: KCA-R42FM.... can anyone find me this for a cheeper price then 100?

About the only way you're gonna get one cheaper is if you get lucky like I did and find one on eBay. I got mine over a year ago from a guy that had 50 of them for sale. Got it for $35 off of him.