2000 Jeep Cherokee Sport, CD Changer

Hi. I have a 2000 Jeep Cherokee Sport , I want to install a cd changer - box, went down to the Jeep Rep. here in Portugal, the guy told me would cost me about 500 Euros for a CD box and the only that works in the radio that the car has is Alpine and that´s why can be this price....

 

Does anyone who has a CD changer-box on his Jeep,  has one that i´ts not alpine and works? I really apreciate all your help ´couse im not willing to spend that much. went to ebay site and found so many radios w/ cd box for Jeep but I think it´s too risky, not knowing for sure if it will work on my Jeep.

iam looking for a CD BOX that reads MP3for a jeep cherokee of 2000. All the help is welcome.

 

THX!