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by yogeshp 1284 days ago
I prefer books which have rating of at least 4.2 on Goodreads and 1000+ reviews. Higher the better.

Interval is sporadic. If I think it is urgent, then order it immediately, else keep in Amazon wish list and buy when there is a good discount or during sale. If physical copy of the book is expensive, then I consider kindle edition if kindle version is much cheaper.