Now, however, gray market sales are taking om on campuses At one prestigious university, a sophomore imported 30 biology books from Englang this fall and sold them outside his classroom for less than the campus-bookstore price, netting a $1200 profit. Next semester, if all goes well, he plans to expand the operation. "The only difference is that they say 'international edition' in little print on the cover, "said the student, who added that he was not certain whether his project raised any legal issues, and therefore asked that neither he nor his college be identified . At other colleges, Asian students have banded together to take advantage of textbook prices in Taiwan, Singapore and Malaysia, which are even lower than those in Europe. Many students individually, have begun to compare the textbook prices postal on American sites like Amazon.com, with the lower prices for the same books on foreign sites like Amazon.co.uk. The differences are often significant: "Lehninger Principles of Biochemistry, Third Edition," for example, lists for $146.15 on the American Amazon site, but be had for $63.45, plus $8.05 shipping from the British And "Linear system Theory and Design, Third Edition" is $110 in the United States, but $41.76,or $49.81 with shipping. in Britain Many college bookstores, meanwhile, have taken matters into their own hand arranging their own overseas purchases. I buy from Amazon.co.uk and from sources in the Far East, and I knew, more and more students were doing the same thing individually," said Tom Frey, owner of the University Bookstore at Purdue University, who sells the new books from overseas at the same price as a students at the Indian Association here at Putdue had just gotten a delivery of 14 skids of books, about 50 books each, from India, I think I'm losing about 10 percent of my sales to overseas books.