Amazon UK has this on sale today

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£100.00 HarperCollins (Slip-cased set) - Availability: Click to check
$74.80 Amazon.com (Hardcover) - Availability: IN_STOCK_SCARCE
£58.12 Amazon.co.uk (Hardcover) - Availability: IN_STOCK_SCARCE
€74.99 Amazon.de (Gebundene Ausgabe) - Availability: IN_STOCK_SCARCE
$68.35 AbeBooks - Availability: Click to check
$70.90 eBay US - Availability: Click to check
£70.90 eBay UK - Availability: Click to check