I give weekly sight-singing classes, as well as private instruction at my home in West Los Angeles.
Groups consist of from four to six people.
It is advertised as a self-teaching course as it comes with a CD or cassette according to your preference. I find that some people do need guidance, at least intially, in learning to use the materials. There is an intermediate course as well which teaches you to read in chromatic fashion. I highly recommend this course and would be glad to talk with you about it.