Amazon UK has this on sale today

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£100.00 HarperCollins (Other Format) - Availability: Click to check
£95.00 Bookshop.org (UK Only) - Availability: Click to check
$Unknown Blackwell's (hardback (boxed set)) - Availability: Unknown
$102.02 Amazon.com (Hardcover) - Availability: Now
£74.86 Amazon.co.uk (Hardcover) - Availability: Now
€80.72 Amazon.de (Gebundene Ausgabe) - Availability: Now
$80.24 AbeBooks - Availability: Click to check
$95.00 eBay US - Availability: Click to check
£95.00 eBay UK - Availability: Click to check