Cheapest I can find for the debut album from supergroup 'Them Crooked Vultures' made up of Dave Grohl of Foo Fighters fame, Josh Homme of Queens of the Stone Age fame and John Paul Jones of... Led Zeppelin fame! Released in the UK on November 16th. Not sure how many people this is going to interest, but ah well!
Really good sound to these guys, sounds exactly what you expect a mish mash of those three bands to be. Here's a track off the album, called New Fang: http://www.youtube.com/watch?v=S7_vH3H8LPI
Free download of Mind Eraser, No Chaser available on iTunes too.
There are £1 off codes around the internet in various places so you might be able to get it down to £5.74!