Covenant Seminary is located in St. Louis, MO. It is a top-notch seminary that is well-respected. For the last several years they have made a number of their classes available for free!!! You can download mp3 audio lectures, class notes, and professor manuscripts all for nothing.
They have classes on church history, preaching (recommended by me!), Bible classes, and much more. You can seriously take almost every required seminary class for no cost at all!! Whether you are a die-hard Bible student or a laid back church goer, there is something in these classes for you.