Last night, I needed to purchase the 10th grade English textbook for Melissa. I wanted to pay with Paypal and Amazon does not accept Paypal. A childhood friend has purchased some books on AbeBooks, but they do not accept PayPal. Then, I remembered Alibris. Alibris accepted my Paypal payment. Also, before placing my order, I looked on RetailMeNot and I found a coupon code, for a 15% discount on the price of the textbook. The price of the used textbook was $30.00 and the discount was $4.50.
Something I have occasionally noticed, when looking at the price of the same textbook on Amazon and on AbeBooks, is that occasionally the same book from the same seller has a different price, sometimes lower, sometimes higher, on AbeBooks. For this textbook, the price, for one seller, on AbeBooks was approximately $20.00 higher than on Amazon. It is important to check prices on more than one marketplace!