Why pay more

I always wondered why books cost so much money. I don't understand why sometimes you can get the same book from two different places and the difference in price is huge. Just today I was looking for book for Ken and I found it much cheaper online than in the book store. It was amazing to me the difference in price for Amazon books. The very same school book that Ken needs for hi class is selling at the school book store for $144.25. Where I can get him the exact same book for only $62.00. I showed this to Ken and he said we will order it right online then. Why pay the extra when the book is the same. It is amazing how much you can save on college textbooks and every other book you might enjoy.