MIT has a great offer for you. How about everything they use for their classes online for free? This is MIT Open Courseware. From their site:
MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
And yes, they do teach theater classes. Their Theatrical Design area has a wealth of knowledge:
That is a wealth of knowledge from a major school. All for free. If there is anything there that interests you, make sure to take a look. You owe it to yourself to do so.
And if you want to search the MIT OpenCourseWare site for more class resources that you might be interested in, go here.