YogaGlo.com is amazing! I’m a registered yoga teacher, and I use it multiple times a week. I reccommend it to all my students. All the teachers are experienced, certified and well known. Plus you can search classes by style, focus, theme and duration. They also have great beginner series videos to learn safe alignment and concepts first. The sit costs $19 a month, but I split it with several friends and it becomes a great deal. I cant rave about it enough. :)

http://www.doyogawithme.com/