I used to do that too. Much better quality than the built-in CB speaker. But now I have a higher quality speaker that I plug into the Speaker jack of the CB. This way, I get better quality sound, I can locate the speaker where I want, and I can still use the radio. I think I got the speaker I have for $25 at Radio Shack. Very compact, self contained, and sounds good. I mounted mine under the dash on the passenger side.
Hi-Jack over... back to the current item up for sale. If it was fro a Zune I'd be all over it. ;D