The pro store will definatly have them and other free standing stores should have them too, but I don't think counters sell them. I think there £10 but I might be wrong. I know the eyeshadow pans are 7.50 though.
@ Funii Bunnii - Try ringing the Cannon St branch in Brum, I don't think it's a pro store but they may be able to get in in for you from another store.