The creators of urShelf.com have combined the best elements of existing online booksellers to create a mega-site with a streamlined set of options. Students can search by region, campus, and even course to find the books they need. They can choose to eliminate shipping fees (not to mention delays) by doing business with other students on their own campus or at campuses nearby. Sellers can opt to post books at fixed prices, or they can instead sell them auction-style. They can also pre-list books that they plan to sell (say, after completing a course in which they are still enrolled), making demand and availability easier for both buyers and sellers to gauge. As an added bonus, students who refer their friends earn commissions on books that those friends sell. This national college community brings one-stop-shopping to a whole new level, allowing students to spread the wealth by spreading the knowledge.