I don't know why, or if the sale is going on anywhere else... but I'm pretty sure it's not even being advertised. When I look on the website, it still says $169... but they've been selling at $119 since Friday and the price should stay there until at least this coming Friday. Maybe it's just my store, but it's probably worth checking out.
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http://soundcloud.com/thundersheep/lunatic-asylum
http://soundcloud.com/thundersheep/summer-rain