You access the "So Hum" meditation for free right now through the official app. And you can learn the Sudarshan Kriya for a nominal fee—or even free via scholarship—by attending a certified workshop.
For home practice, the "Short Kriya" typically involves 20 long/slow breaths, 40 medium breaths, and 40 short/fast breaths, repeated for three rounds. Proven Benefits of Regular Practice Art Of Living Sudarshan Kriya So Hum Audio.mp3 Free