Another vote for “Think Like a Bird” – probably my favorite flying book.
I also really enjoyed “North Star over my Shoulder”.
One that I can't see on any lists so far is “Behind the Cockpit Door” by Arthur Whitlock. It describes his career in commercial flying from shortly after WW2 to the late 1980s, starting on C47s and finishing on Tristars. One of the ways he supplemented his income was to draw cartoons (for Eagle comic, if I recall correctly) and the book is peppered with fantastic cartoons about his experiences. I think it is out of print, but copies come up on ebay and Abebooks regularly.
A new book, published this year, is “20 West” by Steve Ford. It initially describes his life as a child with a father who was a flight engineer and the influences on him. Then the author trains as a ground engineer before deciding he wanted to retrain as a pilot. He has a precarious career for several airlines, a period working for a manufacturer and then ends up with a UK major.
For online book purchases I often use hive.co.uk. If they don’t have it in stock they usually get it in quite quickly (I think they are a ‘front end’ for one of the book distributors) and they can be cheaper than other well-known online sellers.