The best anomaly in pricing I've yet found on MSN Music.
I did a search for In C[^] aka Plink Plink[^]. Obviously I already have the CD but I was curious about the coverage available in MSN Music.
As you'll see from the first link the CD has just the one 'track', all of 76 or so minutes long.
MSN Music's pricing? $8.91 for the entire album, or $1.39 for the only track.