A compendium of supporting materials together called the CSE 321 Course Packet may be purchased from the UniPrint location on the east side of the Tuttle Park Place parking garage, or it may be ordered on-line at http://uniprint.osu.edu. All these materials are available on-line: the entire packet as a PDF file via the link above, and the separate pieces via links from the SCE Home Page and below.
Do you really need to buy the packet, given that it's also available on-line? It is highly recommended. This packet contains not only copies of all the slides used in class with places for you to take notes on, but also essential reference material such as policies, assignments, and 321-specific component documentation. If you decide later it would be handy to print some of this material, and if you use your own printer to do so, you probably will end up spending more money on printing supplies than on the packet. Worse yet, if you try to use your CSE account to print it, then you probably will end up exceeding your print quota -- and recovering from that will cost far more than the packet.