We couldn't understand why what costs $120 here should cost $50-something there," said Mr. Sarkis, who, with Mr. Kinsley and another classmate, has spent three years building a Web-based company, BookCentral.com, selling textbooks from abroad to students in the United States. "It seemed so sleazy of the publishers. We were sure that college students would be shocked and outraged if they knew about the foreign prices. But it's been this big secret.