Some of the CDs listed on I tunes have different prices with what looks like the same CD any ideas what the differences are?

Why don't you have a look at each of the track lists and all should become clear.
BTW if you posted all your iPad/iTunes questions in the correct forum you would get a much better response.

http://forums.digitalspy.co.uk/forumdisplay.php?f=25

Sometimes it is difficult to know which is the correct forum to use.