Cheapest yet, $3.60 cheaper than last time ($50.86). Previous deals: May - $54.20/$52.50, March - $58.25.
There is also an eBay store that has it for $46.64 Delivered if you prefer, only 8 remaining. Which I noticed at Booko.
There is a third party seller on Amazon for $37.21 (Shopabroad), purchase at your own risk. Feedback is 86%, there is no prime delivery and the delivery time is about 1 month, indicating it will come from overseas.
What’s the book about?