Keep in mind that the you need the language for reading. Most university language courses are geared towards fluency in speaking and hearing as well. I have 2 years of French and 2 years of Spanish, but am not fluent by any means in either one and probably could not pass a translation exam at this point. I am about a 1/3 of the way through Sandberg's French for Reading and have found it very helpful. I have also recently started doing my daily scripture reading in French, which is helping as well. I also have access to a retired French professor if I really get stuck.
If you feel a classroom is the best format for you, many universities have summer language prep courses for incoming PhD students - geared towards the reading and research skills necessary for doctoral work. I would look for one of these classes - the ones I have seen run $600-800, which is generally less than a 3 hour credit course and you would get a lot more out of it.