I recommend buying your computer books in India. US Price for this book is $150 USD. India price is around Rs. 427 which is around $7 USD. Textbook prices, like everything related to education and healthcare are excessively high in the US. A reasonable price would be around $50, which is what this book would cost if it wasn't a textbook.

The same book in Amazon India: http://www.amazon.in/Operating-Systems-Implementation-Tanenb...

Update: Cheaper books bought in India may not be commercially exported out of India