Steve Reich: vinyl, CD and cassette prices

Compare the price of 5 Steve Reich records on vinyl, CD and cassette in UK record shops.

vinylSteve Reich - At UC Berkeley University Museum 11.7.1970£24Sister Ray1
CDSteve Reich - Collected Works£176.99Recordstore2
vinylSteve Reich - Information Transmission, Modulation And Noise£26Sister Ray1
CDSteve Reich - Pulse / Quartet£18Sister Ray1
vinylSteve Reich - Six Pianos / Music For Mallet£26Sister Ray1