Two guys with way too much time on their hands who have made videos to save you time.
Khan Academy is a non-profit run by one man, Salman Khan. There are tons of videos on topics in math, science, economics and other areas. All the videos are posted on YouTube, but you can also download the videos and other materials from Curriki.
Brad Robb has posted over 555 (as of this writing) on Youtube. He is a math teacher in California and records most of his videos while he is teaching the lessons. On his website WOWmath he has organized the videos and other materials.