The greatest thing that has happened in the study of classical Languages, Latin and Greek, is the advent of the internet database resources. I know that a lot of the books needed for these courses are really expensive and sometimes hard to find. That is why I reccomend that all of my students be able to gain access to such resources as the Perseus Digital Library and TLG, among others. They grant students access to all of the most important resources, while helping to midigate the costs. Of course they are by no means perfect yet, but they are still a useful tool to help find the right information.