The site is a free and ad-free tool that searches legal download sites to find the cheapest tracks.
In total, it searches more than 9m tracks at nine download sites: iTunes.co.uk, Amazon MP3, Play.com, 7digital, HMV.com, We7, Tesco, Orange and Tunetribe.
The biggest price difference it has uncovered is £153.02 for Radiohead's Best Of (although it acknowledges that the £159.99 price it uncovered was probably an error).
The price difference on current number one album, Susan Boyle's I Dreamed A ...
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