Famed Japanese Saxophonist, Nobuya Sugawa, has recently released some educational videos on YouTube called, "SAXTIPS." In each video he briefly teaches a topic through explanation, demonstration, and then play along exercises. Unfortunately for the English speakers, the videos are in Japanese; but the website says "English translation is underway!" However regardless of language, there is still a lot of interesting tips and techniques in them. Check them out!
Chapter 1 Section 1: Vibrato
Chapter 1 Section 2: Vibrato Training
Chapter 1 Section 3: High Notes (Excluding Altissimo)
Chapter 1 Section 4: Low Notes
Chapter 1 Section 5: Let's Master Altissimo!
Chapter 1 Section6: Altissimo Training
Chapter 1 Section 7: Altissimo Training - Overtones
Chapter 1 Section 8: Altissimo Training - Intervals