Well depending upon how much time and effort you want to put in to find the parts online, you can save quite a bundle. I picked up a used Honda 6 CD changer on Ebay two years ago for around $150. I ordered the mounting kit from one of the online Honda dealers for around $100 and did the installation myself. I also picked up an extra 6 disc magazine for about $18. Only problem I ever had was cutting the player cable earlier this year when I installed rear speakers. Cost me an additional $60 for a new cable.
Also, 00-03 Insight radio's appear occasionally on Ebay. I picked up a relatively new one for $18, as a spare, about two years ago. The seller told me that he had removed the radio as soon as he got the car. It looked it. No dust, scratches or any kind of wear on the faceplate. When I saw the bid price I figured it was cheap enough to keep around in the event the radio was stolen or broke. Of course, now I have an extended warranty and breakage is covered for the next 5 years.