I have bought books couple of times on Amazon. However, I also notice that the price on Amazon keeps fluctuating. If I check out the book today and then after a few days, the price of the very same books increases. Although I have no idea why this happens. Never has there been a time when the price of the book has decreased. It is really frustrating to see the increase in price every time. I would love to know if there is an alternative to Amazon, which provides better prices. I do not mind buying second hand books also as long as they are in one piece.