I purchased this book for my son who needed it for a school assignment.We looked everywhere for this book.We were able to find it at a few online retailers,but they wanted almost $40.I couldn't see spending that much money plus the outrageous shipping for a book he would use for 3 months,especially since I had 4 other books to buy for the same class.We even went to a used book store-this was the only book on his list they didn't have.I tried Amazon ans was able to find the book in good condition for a penny(yes I said a penny).My only problem was that the shipping cost more than the book,but it was still a reasonable price to pay.The book arrived and I was surprised to find that it was in excellent condition,like new even.It took less than 2 wks to arrive and with shipping I only paid $4 for a book others were charging nearly $40 for.I will definitely continue making purchases from this seller and Amazon.