I work close to Barefoot Yoga & was introduced to this place by some workmates.
Various instructors - different styles - all interesting and I do feel better after attending sessions.
If your new, the instructors ask you if you have any body/muscular issues (back in my case) and then will structure the session to assist that area. They will also provide advice to help improve any issues you may have.
I enjoy sessions by Yan Yan - she is helpful, inspirational, gives great advice and helps get you in the correct position for maximum benefit. (I'm not a big fan of the hovering pidgin position though).
Payment is voluntary - usual expectation is $15 - $20.
Sessions go for 1 hour.

Approximate cost: $15