As a third year computer science student, I love to learn new computer language and the cheapest way to learn such things is Online Tutorial. When I was in 3 year of my engineering I came to know about Udacity.com. Its an online courses website which offers variety of courses at affordable rate and there are even free courses available. To be honest, I picked a free course from Udacity and trust me, it had all the topics covered and literally there was no difference between free and premium course.
The tutor of the course in Udacity are really experienced and know how to clear tough topics. You can even ask the instructor your queries and they mostly respond on that.
If you enroll yourself for a certain course, then you have life time access of that course, its one of the best feature that Udacity offers. Their site is easy to navigate and you can even download your tutorials in video form. Udacity also available for android device, you can easily download udacity for android from google play store and then access all their courses right through you device.