I am selling 2 ISBN's at a time of textbooks that will GUARANTEE you a profit on Amazon (profit in Amazon credit) OR on third-party book-buying sights. Guaranteed profit if you flip immediately after purchasing my leads (because prices fluctuate all the time). But if you purchase from me at 5:00 pm immediately go to the source and lock in your price. 30 minutes later and the profit could be lost. But, I GUARANTEE profit every time, even when you spend the $5 for two, you'll make your $5 back and more!!