Robert Plant: vinyl, CD and cassette prices

Compare the price of 6 Robert Plant records on vinyl, CD and cassette in UK record shops.

vinylRobert Plant - Live At Knebworth£21Sister Ray1
CDRobert Plant - Manic Nirvana£9Sister Ray1
CDRobert Plant - Now And Zen£10Sister Ray1
CDRobert Plant - Pictures At Eleven£10Sister Ray1
vinylRobert Plant - Saving Grace£15.99Assai Records3
CDRobert Plant - The Principle Of Moments£10Sister Ray1